Roback didn’t play for Manchester City again after having a stroke but managed to finish his dream in the summer.
But he says the final treatment of the final season at a club that has played more than 100 games, has left his confidence in “drought.
“I just felt that I might have broken my relationship with the director (Gares Taylor).
“I don’t know if it was me, maybe he hadn’t heard of a clear relationship or the fact that it wasn’t just a clear relationship.
“I’ve gone down and just tried to work every day, but I think a bad situation is done. I’ve always been professional.
Roback says he was “destroyed” to leave City, but joined Barcelona with three titles four Champions League finals.
But he admits that his first training session with the club after six months has become much more difficult outside than he expects.
“After returning from a brain injury and then saying that you have to climb someone, it’s not the most beautiful. But I had to pass through it.
“Barcelona showed me confidence in me and me. It was more important than anyone who said you could play a major role. That’s the fact that they showed me confidence, and they wanted me here and want to improve me.
“Girls are amazing. Three of the three main candidates in the Ballon d’Or were all in this chamber and a shock that everyone is nice, it’s crazy for me.
“So, for me, it’s a complete appropriate and enjoyable to go to every day.
The 25-year-old beat Real Betis 4-1 in December, 303 days after diagnosis and more than 18 months since his last appearance.
“Everyone was waiting for me to be nervous, but I felt good at the moment I didn’t walk there. That’s the kind of mantra that I’m going to.