OFI's 21-year-old Greek centre-back Konstantinos Kostoulas is being monitored by both Sparta Rotterdam and Columbus Crew from the MLS. The central defender, who is under contract with the Greek club until 2028, has reportedly been targeted by the two clubs. Kostoulas joined the club in July 2025 and has 8 caps and 1 goal for the Greece U21 team. His current market value is €800k, according to Transfermarkt.