The 33-year-old Spaniard left Arsenal in 2011 for Barcelona and enjoyed a brief stint under Guardiola at the Camp Nou.
And Fabregas would leave Barca in 2014 to complete a move to Chelsea and play under Jose Mourinho at Stamford Bridge.
The Monaco midfielder lifted the Premier League title under the 'Special One' and suggested that his relationship with Mourinho is much better than the one he shares with Guardiola.
Fabregas told Catalunya Radio's Tot Costa programme: "Mourinho inspired me the most when I left Barca.
"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 prioritised the professional [aspect], and today I still write to him and I consider him a friend."
When he touched on Guardiola, the former Arsenal and Chelsea star said: "With Pep, nothing.
"He was my idol in my childhood and perhaps is the person from whom I've learned the most -- as a player, an idol and a coach. That's it."
Fabregas crossed paths with Guardiola during Chelsea's victory over City in 2016 as the first hint about their relationship rift emerged.
The 2010 World Cup winner approached the City boss at full-time and attempted to shake his hand.
But it appeared that Guardiola snubbed a handshake with the former Barcelona midfielder.
The 49-year-old heated exchanges with Fabregas can even be dated back to 2012 when he managed his fellow Spaniard.
Guardiola appeared to shove Fabregas when he took off the former Spain international during Barcelona's 5-1 win over Valencia.
Featured Image Credit: PA/Marca
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