Sanchez looks glum after suffering freak injury in collision with linesman

Alexis Sanchez returned to training as he faces a race against time to recover his fitness following a freak collision with a linesman during Manchester United's defeat to Paris Saint-Germain.

Tuesday night's 2-0 Champions League loss at Old Trafford was their first defeat in 12 matches under Ole Gunnar Solskjaer's interim management and a reality check to their aspirations this season.

Solskjaer will pick up the pieces and assess a number of injury concerns ahead of Monday night's trip to Chelsea in the FA Cup fifth round.

Lingard is a serious doubt for the match at Stamford Bridge after injuring his left hamstring, while Anthony Martial appeared to aggravate a groin injury during the match against PSG.

Paul Pogba, who was sent off at Old Trafford as United were left with a mountain to climb in the last-16 tie, was engrossed in his phone as he was driven into Carrington for training on Thursday morning.

Solskjaer will have to restore confidence quickly following the first setback of his tenure at Old Trafford.

United had won 10 of 11 matches in all competitions prior to Tuesday night and now face a crucial series of fixtures that will define how successful this season is.

They face Chelsea in the Cup before hosting title-chasing Liverpool in the Premier League the following Sunday.

There then follows league fixtures against relegation-threatened Crystal Palace and Southampton before the return leg against PSG in the Parc des Princes on March 6