The former Red Devils left-back insists the Dutch boss will need his Portuguese striker sooner rather than later.
The 37-year-old has been left on the bench since the transfer window shut with no takers – starting just TWO games all season so far.
“Let’s be clear, to put Cristiano Ronaldo on the bench is a massive statement, because Ronaldo will think it’s not fair, last year he scored like 18 goals, so in his head he will be like ‘why am I on the bench?’
“He’s right, but you have a manager and you have to respect his decision.
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“I understand the frustration of Ronaldo, but also Ten Hag was like ‘I’m going to start a new era, Ronaldo is still in my plan,’ and I’m sure Ronaldo is in his plan.
“Maybe, United need to suffer right now and they will need other players, but you will always need Ronaldo, trust me, there will be a moment when we say thanks Cristiano, please stay, I’m convinced about that.
“I think Ten Hag and Ronaldo need to, if they haven’t already, have an honest discussion. Everything that is happening right now is logic. “
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The forward was keen to leave in the summer and demanded a transfer to a club able to offer Champions League football.
And although a move didn’t materialise, Ronaldo’s future is still up in the air.
Despite grabbing his first goal of the season earlier this month, his United team-mates think he will be off in January.
And Serie A leaders Napoli could also try to tempt Ronaldo into a move after showing interest in the forward in the offseason.