Doubts are emerging over Manchester United boss Sir Alex Ferguson's relationship with defender Nemanja Vidic. Vidic was a surprise late withdrawal from the starting line-up for United's dismal FA Cup defeat to Leeds yesterday.

The Daily Mail says Ferguson's assessment of Vidic's reasons for limping out of the warm-up before the game also appear to hint at a problem in his relationship with the Serbian defender.

Asked why Vidic said he couldn't play, Ferguson said: "I couldn't tell you what the situation is. I couldn't tell you at all."

Real Madrid and Barcelona are both chasing Vidic for next season.