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The former Liverpool star had been linked with a move to the La Liga giants throughout the season and finally got his wish when a £142m deal was finalised on Saturday.
He’ll fill the void left in Barca’s frontline by Neymar, who joined PSG during the summer.
Coutinho is ineligible to play for his new club in the Champions League but he insists he can’t wait to hit the ground running and start winning trophies.
"I'm very happy, very happy," he told Barcelona TV.
Philippe Coutinho and 35 others to leave the Premier League for Barcelona or Real Madrid
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“It is incredible to know that I am going to live with idols, players with a lot of history.”
Barcelona star Philippe Coutinho
"I have always said that it is a dream that I am living and I am very happy to be here.
"To be able to play, win titles, make the fans happy... always play with joy.
"It is incredible to know that I am going to live with idols, players with a lot of history.
"Footballers like Leo Messi, Luis Suarez, (Andres) Iniesta, (Gerard) Pique, (Sergio) Busquets.
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"I am very happy to be able to live together, to be able to learn from them and be able to win together."
Coutinho will be officially unveiled as a Barca player tomorrow and could be in line to make his debut as early as Thursday, as the Catalan side host Celta Vigo in the second leg of the Copa del Rey last 16.
They’re currently top of La Liga, 16 points clear of rivals Real Madrid in fourth.