Barcelona risk losing midfielder Jonathan dos Santos.
The Mexico international comes off contract in June and is yet to open serious negotiations over a new deal.
Barca risk seeing Dos Santos play in the World Cup without tying him to a new agreement. The midfielder is the younger brother of Tottenham winger Giovani dos Santos, who spent part of last season on-loan at Galatasaray.
Jonathan is now represented by Pini Zahavi, who has close ties with England's biggest clubs, including Chelsea, Manchester City, Tottenham and Manchester United.