City can play in the Champions League next season after winning their appeal against Uefa's decision to ban them from European competition, which has been criticised by both the Liverpool and Tottenham managers.
Mourinho described the ruling as "disgraceful and a disaster", although Guardiola is willing to chat with the Portuguese about the issue.
He told Sky Sports News: "If they want to talk, I'm here.
"The sentence from the three independent judges was clear. But, if they want, they know my telephone number, they can call me and I can explain. It's not a problem at all.
"But I think we don't have to discuss a lot because the sentence was clear. All the suggestions that we were lying or cheating, it was not like this. We were clean, like they say are."
Guardiola admits he is pleased that his squad will be able to compete in Europe's top competition as a result of the decision.
The 49-year-old manager said: "I am incredibly happy for them.
"They are the reason why we are in the Champions League next season because of what they have done on the pitch.
"Off the pitch, maybe, other clubs are better, but on the pitch we were quite good the last three or four years, and we will defend what we won on the pitch next season in Europe."