The two are said to have had a frosty relationship since Mourinho's abrupt departure from the Bernabeu and Perez believes that Mourinho's presence at Old Trafford means that any big-money return for the prodigal son would be practically impossible.
'Super-agent' Jorge Mendes represents both parties, but even that link has been unable to reconcile the pair. During his second spell with Chelsea, Mourinho irritated Ronaldo after making the following statement: "I coached the real Ronaldo, the Brazilian one". Mourinho is alleged to have "lost the dressing room" during his time in the Spanish capital, sidelining the likes of Iker Casillas and reports suggest that he and Ronaldo has some sort of falling-out as well.
Aside from the bad blood between the pair, 'Marca' has commented that any return to Manchester would be an exceedingly complex undertaking, due to Ronaldo's age (32) and the size of the transfer fee involved (potentially in the region of €200million+).
The player that Mourinho really wants is supposedly Alvaro Morata. The forward has been linked with a summer move to the Premier League but Real president Florentino Perez is reluctant to see him leave.