Besiktas and Galatasaray, two Istanbul giants, will compete for the signature of Nigerian winger Henry Onyekuru this summer.
Last summer, Onyekuru joined Olympiacos, the Greek champs, but struggled to make an impression.
The 25-year-old failed to register a goal in 14 league appearances for Olympiacos.
Pedro Martins has informed the former Anderlecht player that he is not in his plans for next season.
Onyekuru has had three loan periods with Galatasaray and has strong ties to the club.
Olympiacos paid €5 million to Galatasaray to acquire his services, and a transfer fee similar to that is expected.