Writing for the Sunday World, McGrath declared: "Plenty of critics have suggested Cristiano Ronaldo has been part of the problem for Manchester United this season, but I've never heard so much nonsense.
"As he smashed home the 800th and 801st goals of his remarkable career against Arsenal on Wednesday night, the enormity of Ronaldo's achievements in the game were highlighted once again.
"I did well to make 675 appearances in my career for club and country, yet Ronaldo has scored 126 more goals than games I played in! That is simply remarkable and I have to salute him.
"While he's not playing at the peak of his powers at the age of 36, Ronaldo is still a huge asset for United, and I'm sure Ralf Rangnick will appreciate that when he takes charge of the team for the first time against Crystal Palace at Old Trafford today.
"All teams need a guy who can put the ball in the back of the net, and Ronaldo may well be the best there has ever been at doing that.
"Ronaldo is not the problem here – and Rangnick needs to sort out the other areas of his team to make sure his goal contributions take United to where they want to be."
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