At the age of 15, he enrolled at The John Carroll School in Bel Air, Maryland, and lived with a host family.

[3] Mitrou-Long scored a career-high 29 points including a late go-ahead layup on February 18, 2017, in a 79–74 win against Fairleigh Dickinson.

[4] As a sophomore, he averaged 15.0 points, 5.2 rebounds, 4.4 assists and 1.6 steals per game, earning First Team All-NEC honors.

[5] Mitrou-Long joined former Mount St. Mary's teammate Jonah Antonio at UNLV, who told him that coach T. J. Otzelberger was very honest and straightforward.

[8] Mitrou-Long missed 12 games in December 2019 and January 2020 with a broken thumb, and his season ended after sustaining a knee injury during a February 29 win against San Jose State.

[10] On July 29, 2020, Mitrou-Long signed his first professional contract with PAOK Thessaloniki of the Greek Basket League.

On August 8, 2022, Mitrou-Long signed with Semt77 Yalovaspor of the Turkish Basketball First League (TBL), but he never appeared in a single game for them.

[18] His brother, Naz Mitrou-Long, played college basketball for Iowa State and later in the NBA for the Indiana Pacers.