Over the weekend, Liverpool confirmed that their star man was close to joining Barca for a British record fee, and the Brazilian international has now been officially unveiled at the La Liga leaders.
However, at a press conference, Coutinho acknowledged Liverpool's efforts to keep him, admitting that he was thankful for their decision to accept Barcelona's offer.
The 25-year-old said: "I'm very content. Very happy. Like I said before it's a dream. Thanks to lots of people, firstly God, my parents and my family who are here with me in every moment.
"I'd like to thank the president of FC Barcelona, the directors who had so much patience. I would like to thank Liverpool for the five years I had there and the directors, Mike Gordon who understood what I wanted, my dream, and they tried very hard to convince me to stay.
"To the fans who shared five years with me, thank you."
Coutinho will not make his Barcelona debut for another three weeks after picking up a thigh injury.