During the 2012-2013 season, then head coach Makis Katsavakis promoted him to the first team, though he made his debut on December 2012 in a match against Xanthi FC, after Lucas Alcaraz was appointed as manager.
In 2012–2013 season, being the second-choice goalkeeper of Aris because of the departure with Sifakis, Dioudis started in only the second matchday, against OFI Crete in Kleanthis Vikelidis Stadium, because of an argue between the first goalkeeper of the squad, Markos Vellidis and the coach Makis Katsavakis.