Rio Ferdinand left Manchester United fans hanging over a cryptic blast on Twitter yesterday.

With United fans concerned over the contract issues surrounding youngsters Paul Pogba and Ravel Morrison, Ferdinand fired a furious tweet late yesterday.

"Certain kids need their heads banging, they don't see what they got within reach, if only they FOCUSED 100%. Fix up, Make It Count," rapped Rio, which immediately sparked a response from his 1.8m followers asking whether he was directing his message to his young teammates.

But Ferdinand is still to respond.