Michael Kostantonov

From a state championship at Loyola Academy to the challenge of competing in the SEC, Michael Kostantonov’s football journey reflects the discipline, patience, and determination required to build a career in the trenches.

In football, the most important battles are often the ones that never make the highlight reel. They happen at the line of scrimmage, where an offensive lineman must recognize a defensive alignment, establish leverage, and protect his teammates in the space of a few decisive seconds. Success demands strength, precision, communication, and a willingness to embrace a role that rarely brings individual recognition.

For Michael Milan Kostantonov, the Tennessee Volunteers offensive lineman known by the nickname “Koz,” that work is central to his football identity. Standing 6 feet 4 inches and weighing 322 pounds, Kostantonov has progressed from a championship-winning high school program in Illinois to the demands of college football in the Southeastern Conference.

His journey has included a productive high school foundation, an initial college stop at Central Michigan, and a subsequent move to Tennessee in 2025. The transition has not yet produced a substantial college statistical record, but his career offers a compelling look at the developmental side of football: the years spent learning, competing, and preparing for opportunities that may not arrive on a predictable timetable.

For an offensive lineman, progress is not always measured in touchdowns or individual accolades. Sometimes, it is measured in technique, consistency, and readiness when the next opportunity comes.

• Full name: Michael Milan Kostantonov
• Sport: American football
• Position: Offensive lineman
• Jersey number: 65
• Height: 6 feet 4 inches
• Weight: 322 pounds
• Age: 22 as of October 19, 2026
• Birthplace: Chicago, Illinois
• Hometown: Northbrook, Illinois
• School/College: University of Tennessee, Knoxville
• Previous college: Central Michigan University
• Current team: Tennessee Volunteers
• Class: Junior, according to Tennessee’s 2026 roster
• Years active in college football: 2024-present
• High school: Loyola Academy, Wilmette, Illinois
• Nickname: Koz

Kostantonov was born in Chicago on September 5, 2004, and grew up in the Northbrook area of Illinois. He attended Loyola Academy, a college-preparatory school in Wilmette with a football program that provided the foundation for his development as an offensive lineman.

Kostantonov’s own recruiting profile described a passion for football that began when he was six years old. In that profile, he emphasized leadership, integrity, accountability, and the importance of continual improvement. These were the stated ambitions of a young athlete seeking to compete at the highest level available to him.

His development also reflected an understanding of the offensive line as a position built on fundamentals. Unlike positions that can rely on speed or open-field opportunities to produce eye-catching statistics, offensive line play requires players to master footwork, hand placement, balance, leverage, and coordinated movement. The ability to execute those fundamentals consistently is what allows an offense to function.

At Loyola Academy, Kostantonov developed experience at both center and guard, positions that demand different responsibilities but share a premium on physicality and awareness. That versatility would become an important part of his football background.

Kostantonov’s high school career established a strong competitive foundation. Playing under head coach John Holecek, he spent two seasons on the varsity team and served as a captain in both his junior and senior years.

The results were impressive. Loyola Academy compiled a 12-1 record during Kostantonov’s junior season, followed by a 13-1 campaign in his senior year. The latter season culminated in an Illinois Class 8A state championship. Across those two varsity seasons, the Ramblers went 25-2.

For an offensive lineman, playing on a successful team provides a demanding education in collective responsibility. Every assignment contributes to the result, whether it involves creating a running lane, maintaining pass protection, or executing a coordinated blocking scheme. Kostantonov’s experience on a championship-winning team placed him in an environment where preparation and execution mattered.

His next step was Central Michigan University, where he joined the Chippewas as a freshman in 2024. The program’s official roster records that he appeared in two games, both on special teams, against Western Michigan on November 19 and Northern Illinois on November 30. He redshirted that season.

Those appearances represented an initial introduction to college football competition, although they did not amount to a regular offensive role. The distinction matters: his college record establishes participation, but it does not support claims that he had become a starting offensive lineman at Central Michigan.

In April 2025, Kostantonov entered the transfer portal. He subsequently joined Tennessee during the summer of 2025, continuing his development within a program competing in the Southeastern Conference.

The move offered a new environment and another opportunity to compete. Tennessee’s roster listed him as a redshirt freshman in 2025, and the university’s season biography states that he did not see game action that year.

His progression illustrates a familiar reality in major college football. A successful high school career can create an opportunity, but college playing time must be earned again. A player has to adapt to a new coaching staff, stronger competition, more complex schemes, and the physical demands of a different program.

Kostantonov’s documented experience at center and guard provides the clearest indication of his positional background. His current classification as an offensive lineman does not establish a specific starting role, and Tennessee has not published individual statistics that would support a detailed evaluation of his college performance.

At 6-foot-4 and 322 pounds, he possesses the listed size associated with the physical demands of interior offensive line play. Size alone, however, does not establish how effectively a player performs in pass protection or run blocking. Those assessments require game film, coaching evaluations, or other reliable performance evidence.

His versatility is nevertheless relevant. Centers must communicate protections and manage responsibilities at the point of the snap, while guards must work in tight spaces, handle interior defensive pressure, and coordinate with neighboring linemen. Experience at both positions can provide a foundation for learning different assignments.

Tennessee also identifies Kostantonov as someone who trains with Olin Kreutz, the former Chicago Bears center and six-time Pro Bowl selection. That connection is a notable element of his development. Kreutz played one of the most technically demanding positions on the offensive line, making his involvement a meaningful part of Kostantonov’s documented training background.

It would be premature to attribute specific techniques or performance improvements to that training without further evidence. Still, working with an experienced former professional provides a connection to the standards of preparation and technical detail associated with high-level offensive line play.

Kostantonov’s established accomplishments are concentrated in his high school career and his progression through college programs.

His most significant team achievement is Loyola Academy’s Illinois Class 8A state championship in his senior season. He also helped the Ramblers produce a combined 25-2 record across his two varsity seasons and served as a team captain during both his junior and senior years.

At Central Michigan, his two appearances in 2024 came on the field goal and extra-point units. He has not accumulated a publicly listed individual statistical record at Tennessee.

Kostantonov’s personal approach come from his recruiting profile and official team biographies.

In his recruiting statement, he presented himself as a self-motivated athlete who valued responsibility and wanted to set an example for teammates on and off the field. He also emphasized academics alongside athletics, describing integrity as a priority rather than treating football as his only measure of success.

Those statements are personal aspirations rather than independent proof of character, but they align with his documented history of being selected as a high school captain.

His nickname, “Koz,” is listed in Tennessee’s official biography. The same profile identifies one word that he uses to describe himself: “relentless.” It is a concise expression of the mindset he has publicly associated with his athletic identity.

Academically, Tennessee lists his major as communication studies. The university also included him among its football student-athletes on the 2026 First-Year SEC Academic Honor Roll announcement, published in July 2026. That recognition adds an important dimension to his college experience beyond football participation.

As of October 2026, Kostantonov remains listed on Tennessee’s official football roster as a junior offensive lineman wearing No. 65. The roster confirms his physical measurements, previous school, and continuing place within the Volunteers program.

The available record also places his current situation in context. After playing two special-teams appearances at Central Michigan in 2024 and recording no game action for Tennessee in 2025, he is still working toward a more substantial on-field role.

Tennessee’s official cumulative statistics page for 2026 does not provide an individual statistical line for him. Offensive linemen do not typically accumulate the headline statistics associated with quarterbacks or receivers, but the absence of a listed line also means that no claim of a breakthrough season or established starting position can be substantiated from that source.

His next milestones are therefore straightforward: earn opportunities, demonstrate consistency in practice, develop positional technique, and translate preparation into game participation. Those are developmental objectives, not confirmed personal statements about his future goals.

The SEC presents a particularly demanding environment for offensive linemen, with weekly matchups requiring physical strength, sound communication, and disciplined execution. For Kostantonov, progress will depend on how effectively he meets those challenges within Tennessee’s offensive system.

It is too early to assign Kostantonov a lasting legacy in college football. His publicly documented career has not yet established him as a major statistical contributor or award-winning collegiate player. A credible profile should acknowledge that reality rather than manufacture a story of stardom.

His existing record does, however, reveal a meaningful progression: championship-level high school football, an initial college experience at Central Michigan, a transfer to Tennessee, and continued work toward a larger role. The captaincy he held at Loyola Academy and his academic recognition at Tennessee provide additional markers of his development.

For teammates and younger athletes, his journey can illustrate the distance between reaching college football and establishing oneself within it. Recruitment opens a door; sustained preparation and performance determine what happens next.

Michael Kostantonov’s story is still being written. The offensive lineman from Northbrook has already experienced a state championship, the transition from high school to college football, a transfer between programs, and the challenge of developing within one of the sport’s most competitive conferences.

His accomplishments should be measured honestly, without confusing potential with production. Yet his path offers a useful reminder about the nature of football development: the players who eventually earn important roles often spend significant time preparing outside the spotlight.

Kostantonov’s defining opportunity remains ahead of him. Whether he can turn his size, positional background, championship experience, and commitment to development into a meaningful role at Tennessee is a question future seasons must answer. For now, his most compelling attribute is not a statistical record or a headline-grabbing performance, but the unfinished work of a player still pursuing his place in the game.