Krkic was furious at not playing any part in the 3-1 Champions League final win over Manchester United at Wembley stadium.
"As a fan Pep Guardiola is the best coach in the world, but personally things happened to me that hurt me and I can't say the same thing," Bojan said in a press conference.
"I haven't spoken with him since the Champions League final through my own choice.
"I am still smarting from the final in London. Winning the Champions League final was important to me and it hurt me a lot that I didn't play. It was the second time it happened to me.
"He (Guardiola) wasn't fair with me on several occasions and that is one of the reasons that I decided to leave.
"I spoke with Pep (Guardiola) a lot but things between him and I weren't very clear and what was clear was that I wasn't playing."