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The official event has now concluded.
With that Coutinho shakes some more hands and heads off the stage pursued by a camera crew from Barca TV.
Well that's it for the questions now.
He said: "They're the biggest club in the world. A lot of my idols, past and present, play here."
He has been asked about how many times he dreamed of this day; walking out on the Nou Camp pitch in the Barca colours.
He said: "Many times but not just signing for the club - also to play big games and score big goals for the club"
On being another great Barca Brazilian?
He said: "I'm very aware of it."
Coutinho said: "That's the coach's decision. I'm just here to work hard and do my best to help the team.
More on Suarez.
"We almost won the Premier League together. It was a great time. He told me a lot about the city and the club and made me want to come here even more."
Coutinho has been asked about playing with Luis Suarez again.
He said that Suarez is a good friend and sent him a lot of messages asking him to come. He even helped him find a house.
Mestre reveals there is a clause in the deal between Barca and Liverpool forbidding him from revealing the total transfer fee.
An English journalist has asked him a question now.
He has asked about the Nike website accidentally publishing a picture of Coutinho in a Barcelona shirt before he left Liverpool.
Coutinho said: "That's in the past. I'm just happy to be here. I want to reiterate my thanks to Liverpool for helping me realise my dreams."
He has been asked how he feels today.
He said: "It feels great but it will feel better when I'm out on the pitch training with my team-mates."
Mestre: "I won't discuss the numbers. They are between the two clubs. The important thing is we have the player here."
Coutinho was asked about his experience in Italy England and Spain and what was hardest.
He said: "Spain is very intense like the English Premier League but they're all difficult. I'm just very happy now and looking forward to playing here."
"I was always clear from the very beginning and want to thank everyone who understood my desires and those at Liverpool who kept their word."
"The question of money was between the clubs. I'm just here to win and be happy."
"I've been friends with Neymar since he was a kid. I will meet Messi soon. They are two great players.
"Can I help Barca fans forget about Neymar? I'm not here to do that - I just want to play well for the fans."
Barca have been asked whey they initially said they wanted no bidding war but then shelled out £142m to Liverpool for Coutinho.
Mestre said: "There was an important reduction in the cost of this transfer. We can't go into numbers."
Coutinho said: "I watched the game yesterday from my hotel and I met some of the players at the training ground earlier. I'm just anxious to get going now."
One question per journalist and 20 minutes duration.
Speaking in slow, steady Spanish Coutinho is answering his first question.
I'm pretty sure he's going through the obligatory thank yous at present: Barca, his family, God and Liverpool.