Everton have reportedly agreed to include a buy-back clause for Barcelona in the deal to sign Yerry Mina.
The Toffees won the race to sign the Colombia international before the end of the Premier League transfer window, with Mina penning a long-term deal at Goodison Park.
Reports suggested that Barcelona had the option to re-sign Mina at a later date, and according to Marca, the clause cannot be activated until 2020.
The Catalan giants will allegedly have to pay €60m (£53.97m) if they want to hand Mina a return to Camp Nou in two years' time.
The 23-year-old is yet to make his debut for the Merseyside outfit, who have registered four points from their opening two fixtures in England's top flight.
