The Premiership's biggest clubs are on red alert after Samuel Eto'o threatened to quit Barcelona on the eve of their Champions League semi against Manchester United.

United, Chelsea, Arsenal and Liverpool are all interested in the Cameroon ace, who snapped: "At Barcelona and in Spain I have reached the top.

"If next year we continue the same without winning titles here, I will have to go to another place because what I want is to win titles."