It's now six seasons since Thiago left Barca for Germany.
"I always wanted to play and I saw that this was not possible at Barça. I had to take that step to be happy playing football. I wanted to do much more than raising a trophy, because in the end you ask yourself: 'How much have I been a participant in that title?'," he said.
"I will always be grateful to Barça, but I left because I wanted to compete and did not want to be typecast.
"When Pep Guardiola called me, I did not think twice."