Starting his youth career at Vataniakos, the left-back graduated to the side’s first-team in 2012, making 33 appearances for the Katerini-based team before signing for PAOK.

The left-back was signed after the loan of Xavi Quintillà from Villarreal had been disrupted by injury problems, forcing midfielder Jacob Sorensen into a length stint as cover.

[11] The Greece international left-back was then left out of the 2–0 loss at Swansea but started to find his rhythm and show his ability during the 4–1 win over Stoke and the 2–0 victory over Coventry.

Giannoulis impressed Norwich City supporters with his performances during the season, getting forward well from his left-back position to help set up several goals as well as defending resolutely.

The end of his campaign was also disrupted by a harsh red card bringing a three-game ban, on the day that promotion had been sealed.