Manchester United FA Cup winner Paul McGrath believes Cristiano Ronaldo will become an issue for manager Ole Gunnar Solskjaer this season.

McGrath wrote for the Sunday World: "I fear that substituting, or leaving Ronaldo out of games completely, is going to be an issue for as long as he plays for the club in his late 30s.

"He can't go 90 minutes in every match all season – we know that.

"So every time United lose or draw a match this season in which the Portuguese superstar does not start, is taken off, or is left out of the match-day squad altogether, there are going to be questions asked about the strategy.

"It is why, when I wrote here a couple of months ago about the Glazer family getting back into the fans' good books after the European Super League mess, the three players I identified as a proper target for Solskjaer were Harry Kane, Kylian Mbappe and Erling Haaland.

"Each was young enough that the question of 'managing the minutes' would never arise.

"It will always arise with a 36-year-old, even one with the ferocious fitness ethic of Ronaldo.

"As will his ongoing desire to play for Portugal."