Ancelotti was sacked by Real Madrid in 2015 just one year after winning the Champions League.
The Italian was popular among the players but club president Florentino Perez opted to replace him with Rafa Benitez.
He is now at Bayern Munich, who are aiming to overcome a 2-1 first leg deficit to knock his old employers out of the Champions League tomorrow.
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And Ancelotti has claimed that his decision to hook Gareth Bale in a 2-1 defeat to Valencia at the start of 2015 led to a breakdown in relations with Perez.
“The CEO told me the president wanted to talk to me," he said in his book Quiet Leadership: Winning Hearts, Minds and Matches.
"When I went to his office, he told me that Bale had called him. I had replaced him on January 4.
Carlo Ancelotti was sacked by Real Madrid despite winning the Champions League
"Bale’s agent had complained. The president told me what he was going to do.
“Since then, the relationship with the president changed and has not been the same.”
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