Rooney and Ronaldo spent four years together at Ronaldo, and won the Champions League together in 2008.
And he has told talkSPORT: "For the fans it will be great to see Cristiano back, it's very exciting for everyone at the club,
"For them it would be a massive help, I'm sure. He'll bring his mentality to the club.
"He's still one of the best players in the world, so I think it's a very good signing."
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