Russian premier league

Belgian Jupiler Pro League: Indian Super League (ISL) Cup winners Mumbai City FC have signed Nikolaos Karelis on a one-year contract until the end of the 2024-25 season. Karelis began his journey with Greek side Ergotelis at age 16, making his debut on the final day of the 2007–08 Greek Super League season and becoming the youngest player ever fielded for Ergotelis in a league match. He has showcased his skills extensively and successfully for Greek clubs like Panathinaikos, PAOK, and, most recently, Panetolikos, whom he captained.

Outside Greece, Karelis has featured in other top European countries, including stints with Genk (Belgian Jupiler Pro League), ADO Den Haag (Netherlands Eredivisie), Brentford (English Championship), and Amkar Perm (Russian Premier League).

The 32-year-old has also made his mark in the UEFA Europa League group stages, featuring in the event for both Panathinaikos and Genk and scoring four goals in 12 appearances. Throughout his club career spanning 361 games, Karelis has been known for his all-round game and contributing in the final third, with 103 goals and 29 assists.