Coutinho arrived in January from Liverpool for a fee rising to €160m.
"Everyone knows that I wanted to come to Barcelona," he said to 8tv's 'Fora de Joc' programme.
"It wasn't possible in the summer, but we worked so that it could be done in winter.
"I really want to win big titles, it was one of the reasons that made me sign for the club.
"I want to win as many as I can, I don't have preferences."
There's still the issue of where Ernesto Valverde can best utilise Coutinho's skill set, but the player himself is happy to play anywhere.
"I don't care about the position, I'll play where the coach tells me," he continued.
"It's all different at Barcelona, and though I've played more times on the left, I'll adapt wherever."