Wayne Rooney
Wayne Rooney is doubtful for the clash against Manchester City Getty

Manchester United have suffered further injury crisis following reports suggesting that captain Wayne Rooney is doubtful for the crucial clash against arch rivals Manchester City on Sunday.

According to the Telegraph, the Red Devils skipper suffered a foot injury during training and was seen limping off the training ground on Monday.

Rooney has just completed his three match ban following the red card he picked for lashing out against Stewart Downing during the game against West Ham United. The Englishman was supposed to return for the Manchester Derby, but is now doubtful after picking up the injury in training.

The report claims that the Three Lions captain, who attended a commercial event at Old Trafford on Monday afternoon, was seen in considerable discomfort as he finished the photo call with the rest of the first-team members.

With Colombian striker Radamel Falcao also receiving treatment for a thigh injury, it is a big blow for Louis van Gaal, who will have misfiring striker Robin van Persie as the only available forward for the clash against the Premier League champions.

Rooney's loss will be felt more, as he has always been in top form when it comes to games against their cross-town rivals, having scored five goals in the last four games against the Cityzens.

However, United are hopeful that Rooney will recover from the foot problem and be ready to take the field. The Dutchman is set to bring him straight back into the team in place of Spaniard Juan Mata, who will find it difficult to get a place in the starting XI following the England international's return.

Falcao, who is yet to find full fitness following his move from AS Monaco in the summer, is also hopeful of returning for the clash against City and Van Gaal was optimistic regarding the player's injury following the Chelsea game.

"Falcao took a kick in training on Thursday and couldn't play [against Chelsea] because of that. We'll have to wait and see, but I don't think the injury is too bad. The Chelsea match came too soon for him," Van Gaal said, as quoted by the Telegraph.