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Cristiano Ronaldo can become the greatest player of all time at Manchester United - but he must go back to being the 22-year-old kid with no airs and graces who they remember so fondly at Old Trafford, according to Stan Collymore.

Despite leading United's scoring charts with 18 goals this season, Ronaldo has cut a frustrated figure since his stunning return to Manchester last summer - and Mirror Football understands the club would not stand in his way should the veteran decide to leave this summer.

The 37-year-old has earned criticism for failing to acknowledge fans before storming off the pitch on multiple occasions, while Ronaldo could not disguise his anger after being substituted by Ralf Rangnick against Brentford in January.

Ronaldo's frustrations stem from problems both on and off the field: United's expected Premier League title challenge has failed to materialise, with the Red Devils now even in danger of failing to qualify for Champions League football next season.

There have also been accusations that Ronaldo has disrupted the United dressing room hierarchy, with the Portuguese legend and captain Harry Maguire reportedly on opposite sides of a battle for authority.

After recent injury troubles, Old Trafford fans saw the very best of Ronaldo as he