Sporting Lisbon want to upgrade the contract of striker Ricky van Wolfswinkel.

Chelsea, Manchester United and Liverpool have all been confirmed as suitors for the young Dutchman.

But O Jogo says Sporting have told agent Louis Laros they want to increase Van Wolfswinkel's wages and also his buyout clause. The only problem is that Sporting cannot sign off on the new deal until they find a new cash injection.