Manchester City midfielder Matheus Nunes admits regret over the way he left Wolves.
Nunes and City face his former club this weekend, having been criticised by Wolves bosses for his behaviour in the final days.
"I can understand there are some supporters not happy with my decision and for that I'm sorry," he began.
"I made my decision but it was an opportunity I couldn't say no to. Manchester City is a top [club] with the best players in the world, the best manager. They won the treble last year. I don't know if I'd ever get that opportunity again, so I just took my chance. I'll always be grateful for Wolves giving me that opportunity.
"I know it may upset some fans about my decision to not train. For that, I'm sorry. It was something, maybe I would have done differently but it was my decision because I couldn't let this opportunity pass by."
Asked how he could've done things differently, Nunes continued: "Maybe trying to be more calm.
"More calm, I wanted this very badly. Maybe more calm.
"It happened very quick, I didn't know before that. As a football player you always want to play for a top team that wins titles. My head was still at Wolves. I didn't think of leaving because it was late [in the window].
"It's not going to happen, my focus this year - I'm going to play for Wolves and give my best like I've always given. If it comes, it comes, but I didn't expect it to come when it did.
"Wolves gave me the opportunity, I'll always be grateful. That was my dream. I want to win trophies, I wanted to be coached by the best manager. Wolves have an amazing team as well, I left a lot of good friends and amazing players. They [City] won the treble and it's hard to say no. I was very happy when City came."
He added, "I understand [the comments], because of the way everything happened. It all happened really quick. I was a fan before as well, when you see something and think 'this is what happened', you believe in that because you don't have another point of view. It's fair, I understand, they want the best for their club and when you don't perform at your best, it's a normal thing and you have to deal with it and accept it."
