Thiago says he didn't feel "valued" by Barca.
"It's unfair to say I wasn't patient. The club knew my situation. I waited for them, especially before the European Championships, but they never contacted me. I didn't feel valued.
"I wanted to compete. The club knew that I wanted to leave and they didn't do much to change that.
"Everyone looks out for their interests, I wanted to feel valued and I wanted to compete so I decided to leave the club and join Bayern.
"I was waiting and waiting all summer, there was a point when I had to decide.
"All a footballer wants is to play football and I wanted to play, they [Barcelona] didn't do much for me to stay, so here I am."