The forward, who has fired 24 goals this season, is not a problem new manager Erik ten Hag needs to remove, insists Brown.
“Ronaldo has to stay and I can't see why anyone would dispute that," declares Brown, speaking to the Sunday World at a Gambling.com event in London.
“Listen, people can say whatever they want about him, but he is the complete goal machine. Probably the best at putting the ball in the net of all-time.
“There have been so many times this season when we have not been at our best and he has dug us out of a hole.
“He was massive on some of the Champions League nights, the hat-trick against Tottenham a few weeks back was fantastic and there have been too many games when he has dug us out of trouble. That's what Ronaldo brings to this team.
“He might be at the back end of his career and he is not the future, but he has got United out of a lot of trouble this season and I think Ten Hag needs to keep him for next season because how can you say United or any team don't need Ronaldo."
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