He discussed the long-running issues between himself and Villas-Boas, now in charge of Marseille, during his time at Stamford Bridge.
He told HLN: "Once I had to play in the front left, another time in the front right. You don't develop that way.
"Then at some point you have to think about yourself. So I told the club what I thought of it. I know: Villas-Boas was also under pressure. But that's why he didn't have to treat me like that.
"(Roberto) Di Matteo approached me completely differently, he immediately involved me in everything. That should have been much earlier. Really, I never forgave the previous coach."