The 20-year-old striker made a €15 million switch to the Yellow Submarine last week, but Manchester City have ensured a return to England is possible
Manchester City made sure a €25 million buy-back option was included in their deal to sell Enes Unal to Villlarreal, the striker's agent says, adding that Monaco and a team from Germany were interested.
The Turkey international joined City in 2015 from Bursaspor before loan spells at Genk and NAC Breda before impressing thoroughly in the Eredivisie with Twente.
His 18 goals in 32 games for the Enschede team saw many teams linked with Unal, but it was Villarreal who landed him in a €15m move.