Di Maria joined Real in the summer of 2010 from Benfica and left the Spanish giants for Manchester United four years later in what was a British record transfer fee of £59.7m.
Both Ronaldo and Mourinho are represented by Portuguese agent Jorge Mendes.
However, allegations of tax fraud - denied by the forward - have brought Ronaldo's future into question and United have been heavily linked with a swoop for their former star.
According to media reports Ronaldo is unsettled at Real Madrid because he believes the European champions did not back him as fully as he had hoped in his dispute with the taxman.
Ronaldo is accused of defrauding Spanish authorities of 14.7 million Euros (12.95 million Pounds) between 2011 and 2014 and will now testify on July 31, reports The Independent.
Amid swirling reports that Ronaldo wants to leave Real Madrid and return to Manchester United, comes a fresh report from Spain's Marca that Mourinho is not in favor of a big-money move to sign the reigning Ballon d'Or victor.
"I know Cristiano, he's a good guy as a professional and as a person", stated Perez in his interview with Marca and Onda Cero on Monday.
Cristiano Ronaldo and Jose Mourinho may not be having that reunion at Old Trafford after all. This has, according to the AS report, been enough for Ronaldo to reconsider his decision to leave the club.
"Cristiano is a good man and he is being made to look like a criminal.I don't think he is annoyed at us, I think he is annoyed at the general situation".
"The whole thing is very unusual because Cristiano Ronaldo is a great guy, both as a player and a person".
Ronaldo - on duty for Portugal at the Confederations Cup in Russian Federation which ends on July 2 - is facing four charges of fraud through offshore companies between 2011 and 2014.
"I have not spoken with him".