Ronaldo's future at Real Madrid looked guaranteed after lifting his third Champions League title with the club earlier this month, the Portugal worldwide scoring twice in a 4-1 win over Juventus.
Manchester United and PSG were instantly linked with moves while Express Sport understands Chelsea also hold an interest.
Mourinho was accused by a state prosecutor of defrauding Spain's Tax Office of $3.7 million.
Real Madrid star Cristiano Ronaldo has been summoned by the Spanish authorities as part of the investigation into his tax affairs.
Alongside compatriot Jose Mourinho, Ronaldo joins an elite group of soccer players, including Lionel Messi and Javier Mascherano, who have been convicted of tax evasion and fraud, as wealthy sports professionals come under increased financial scrutiny.
Ronaldo is reportedly still willing to follow through with his threat of leaving Madrid and it is now up to Perez to convince the club's all-time leading goalscorer to reconsider.
Cristiano Ronaldo has been accused of failing to pay €14.7m on image rights earned between 2011 and 2014.
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Spanish prosecutors said on Tuesday they had filed a claim against the current Manchester United manager on two counts of tax fraud in 2011 and 2012.
Mourinho left Real Madrid in 2013 to manage Chelsea for a second spell before signing with United past year. "Ronaldo is in a major tournament with his country and until that is over I can not talk to him".
It will now be up to a judge to decide whether to take Mourinho to court.
Four-time Ballon d'Or victor Ronaldo is accused of diverting €150m of advertising revenue and image rights through a shell company in the British Virgin Islands, a tax haven.
The prison term will be suspended as is common in Spain for first offences for non-violent crimes carrying a sentence of less than two years.
Barcelona star Lionel Messi was sentenced to a 21-month jail sentence and 2.09-million-euro fine previous year for tax fraud.
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