Manchester United fans were over the moon when it was announced, back in August, that Zlatan Ibrahimovic had signed a one-year deal with their club.The charismatic Swedish striker ‘left Old Trafford’ earlier in the summer as he recovered from the serious knee injury which kept him sidelined during the final weeks of the 2016-17 campaign.However, with doctors confident of his long-term fitness following his unexpectedly swift recovery, Jose Mourinho handed Zlatan another contract until the end of the campaign.The 36-year-old, who netted 28 goals in all competitions last term, has made seven appearances for the Red Devils this season.But he’s only managed to score one goal - and that came against Championship side Bristol City in the Carabao Cup.Zlatan has failed to score in any of his five Premier League appearances this term and, in truth, has looked worryingly off the pace.

Zlatan subbed at half-time v Burnley

The veteran forward was subbed off at half-time against Burnley on Boxing Day after United went into the break 2-0 down following goals from Ashley Barnes and Steven Defour.

“Wandered around like an ageing prizefighter looking for a knockout blow,” the Manchester Evening News, who handed Zlatan a 3/10 rating for his performance, summarised. “You could feel his frustration as he tried and failed to make things happen despite getting in some promising positions before being taken off at half time.”

What Man Utd fans are tweeting about Zlatan

Following that display - and going off what they’ve seen from the superstar since his return to action - an increasing number of United fans fear Zlatan might be finished.

Check out these tweets…

Fans are right to be concerned

It’s probably a little too early to be writing off Ibrahimovic just yet, although his advancing years means supporters can be forgiven for feeling concerned.

Zlatan may feel like he’s immortal but age catches up with every footballer and he’s no exception.

Man Utd fans: is Zlatan finished - or will he prove his doubters wrong yet again? Have your say by leaving a comment below.