Koeman was sacked and eventually replaced with Xavi by Laporta earlier this season.
Speaking to AD, the Dutchman said: "It was my most difficult period as a coach.
"You won't see me at Camp Nou for a while, I can't do that yet. Not with this president (Joan Laporta), I can't pretend that nothing happened.
"I was not given the time that was given to the new coach, Xavi. I still find it painful."
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