Everton’s Oumar Niasse is attracting interest from Sporting Lisbon, Besiktas, Hamburg and Fenerbahce, according to Sky sources.
Niasse became the third most expensive player in Everton's history when he arrived for £13.5m in January but he managed just 152 minutes of competitive football under Roberto Martinez.
The 26-year-old is one of five Everton players not to be allocated a shirt number for the 2016/17 Premier League season.
Niasse is joined by forwards Conor McAleny and Leandro Rodriguez, winger Aiden McGeady and defender Luke Garbutt in missing out on a squad number.
The Senegal international played only one half of a behind-closed-doors match during Everton's Austrian training camp but has not featured in any of the club's four friendlies.