 On December 23, 2019, after a very productive and successful stint with Ionikos, Mavrokefalidis transferred to the Greek EuroCup club Promitheas Patras, in order to replace Georgios Bogris on the club's roster.Mavrokefalidis helped Greece win the bronze medal at the 2003 FIBA Under-19 World Cup.He also played at the 2004 FIBA Europe Under-20 Championship.