Rio Ferdinand has admitted that he is 'worried' about one Manchester United star just a few months on from his summer move to Old Trafford in the wake of the side's disappointing derby performance against Manchester City.
Ruben Amorim's side have had a less-than-impressive start to the season, going until their Premier League third match - against newly relegated Burnley - before securing a win.
But after the international break, Man United were unable to build on the victory, limping to an uninspired 3-0 defeat against their crosstown rivals on Sunday.