Manchester United manager Jose Mourinho says he won't waste time on pursuing Cristiano Ronaldo as he feels Real Madrid won't sell "such an important player for his club".
Reports throughout the off-season have suggested the former United winger was unhappy in Spain, as a result of accusations of tax fraud, and was keen on a return to Old Trafford.
However, those rumours have proved to be unfounded, with Ronaldo currently focused on preparing for the new La Liga season.
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Speaking after his team beat LA Galaxy 5-2 in the first match of their pre-season tour of the United States on Sunday, the United boss said it would be impossible sign Ronaldo.
He explained: "I am not going to get my club to waste time on players who are mission impossible.
"Ronaldo is such an important player for his club. A player of great economic power. We have not been able to find any reason that could have made us think that Ronaldo could leave.
Mourinho also revealed his disappointment in his attempts to sign Real Madrid striker Alvaro Morata.
"It is a shame," he added.
"He is a player who made it to the first team with me and I have a special liking for. I enjoyed watching his evolution in Juventus and Madrid.
"But we have not reached an agreement with his club and I don't think he can end with us."