The Spanish midfielder revealed that he hasn't spoken to his former coach and "idol" at Barcelona ever since Guardiola left the Nou Camp in 2012 and suggested that the pair's relationship has been damaged beyond repair.
Asked if he'd been in contact with the Manchester City coach, Fabregas told CCMA: "No, no, with Pep nothing at all.
"I don't know if the disappointment with Pep is mutual. Things happened, but I prefer not to talk about it. Pep was my idol since I was a child. It is from him that I have learned the most, perhaps, since I was four until now."
Fabregas also confessed that he enjoys a far better relationship with Jose Mourinho, having worked with him at Chelsea.
He said: "Mourinho inspired me the most when I left Barca.
"He told me that we had had our issues on the pitch when he was at Chelsea and I was at Arsenal and then when he was coaching at Real Madrid and I was at Barcelona, but that for him, it all ended there. We turned the page.
"He told me about his project. I had to go where I thought I would do best, the decision was mine and it didn't depend on what people said. I prioritized the professional [aspect], and today I still write to him and I consider him a friend.
"He helped me a lot at a difficult time in my career and perhaps I played one of my best seasons with him."