He currently plays for FC Artmedia Petrzalka, wearing the number 19 shirt. At the international level, he represents Greece U19. He plays primarily as a Defender. His current market value is estimated at 175K €.

His most recent move was a from FC Aris Thessaloniki U21 to FC Artmedia Petrzalka on 2025-07-09.

Throughout the Slovak 2.Liga 2025-2026, Nikolaos Deligiannis featured in 18 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.