The Spanish forward has struggled for game-time this season, making just nine Premier League appearances for the Potters this season.
Bojan featured in Stoke's first five Premier League games of the season, but has played just four games out of the last 16 in England's top-flight.
The 26-year-old has become frustrated at his lack of football this season and reportedly wants a move away from the Bet365 Stadium.
The once-cap Spain international is attracting interest from England and Spain, with Middlesbrough, Las Palmas and Valencia all said to be interested in the former Barca man.
Furthermore, Middlesbrough manager Aitor Karanka did not hide his admiration for the player when asked about Bojan. He said recently: "I know Bojan, because he was in the (Spain) national team. He is a good player, he has played in AC Milan, Barcelona, Ajax, Rome, Stoke, so he is a good player".
Stoke are thought to want £12m for the player, but no club has put a concrete offer on the table for the player yet.