Cameroon ace Eto'o has been criticised for comments he made earlier in his career, suggesting he would "rather sell groundnuts" in his village than play for a "pathetic team like Chelsea", while Mourinho was in charge.
The 32-year-old has moved to clear up the comments, revealing he was referring to playing under a Mourinho-led side, not Chelsea, and he acknowledged that, after working with his current boss at Inter Milan, he got it wrong about the Portuguese.
"I was talking about Jose - not about Chelsea," Eto'o told The Sun. "Before meeting at Inter, we didn't know each other personally, so our relationship was tense. I even said one time that I'd never play for a club where Jose was coach.
"But God knows best. He wanted to show me that I was wrong and today Jose is a friend. Now he's my coach again.
"It's a real pleasure to team up with him once more and join a great team.
"Jose has a real clear idea. He talks straight and it's really important in this business. He's sincere and straightforward.
"When it comes to Jose, I can't pick out only one quality because he's as good on the pitch as off it and this is rare for a manager.
"He's one of the best. He got in touch. I realised there was an opportunity at Chelsea - and things moved very fast."