Sporting CP goalkeeper Antonio Adan admits people at the club discuss Cristiano Ronaldo's return.
Adan played with the Manchester United striker at Real Madrid.
He told AS: "He can play as long as he wants.
"I or any other Sporting fan would like him to come to Sporting, he is one of the best in the world.
"All his quality and experience would be important, but we know that it is something very complicated."
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