He is on the books of FC Artmedia Petrzalka and wears shirt number 19. At international level, he features for Greece U19. His main role on the pitch is Defender. His stronger foot is Left. His estimated market valuation currently stands at 175K €.

His latest transfer saw him join FC Artmedia Petrzalka from FC Aris Thessaloniki U21 via on 2025-07-09.

Across the Slovak 2.Liga 2025-2026, Nikolaos Deligiannis appeared in 18 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.