Ghanaian midfielder Muniru Sulley was one of four Steaua Bucuresti players who turned up for their mid-season medical in a Mike Tyson T-shirt.
Sulley has returned to Romania for the second half of the season for the league leaders.
22 players who have reported from the winter break were medically examined at a clinic in Chiajna.
Cristian Tanase, Paul Pârvulescu and Gabi Tamas were also spotted wearing the shirt which had the image of the boxing legend.