[7][8] On November 11, Mavroeidis made his debut with AEK against Neptūnas in the EuroCup, scoring 4 points, and grabbing 3 rebounds, in his team's 80–86 win.

After the departure of Loukas Mavrokefalidis from AEK on August 27, 2016, the team renewed Mavroeidis' contract for one more season.

He started out the 2021–22 season in an ancillary role, before stepping up after a series of injuries for the team, as well as the death of Stevan Jelovac.

During the 2022-2023 season, Mavroeidis appeared in only 1 league game due to a series of injuries and health issues, scoring 4 points in 4 minutes of playing time.

On May 5, 2023, AEK Athens announced that Mavroeidis was going to retire from professional basketball and would remain on the club as team manager.