After passing a medical earlier on Friday, the 22-year-old signed a five-year deal before presented at the Camp Nou in front of a reported crowd of 20 000.
De Jong said he had received offers from several top European clubs but was convinced to move to Barca after being visited by Bartomeu and other club directors.
"But when the president came to Netherlands I was convinced, my arrival is down to him". As quoted by the club themselves on their official website, De Jong admitted: "I am very happy to be here finally". First your agent talks to them, then you do, you're thinking about the options, what's the best for me.
"This has always been a dream for me since I was small and when I saw it was happening for real it was an easy decisions for me".
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"I'd like to see him [De Ligt] here, but I can not decide".
"I think he has time to think about it and he has to make a decision himself, with his family and his agent, so we will see where he goes".
Frenkie de Jong is in dreamland after officially joining Barcelona and becoming a team-mate of his idol Lionel Messi.
Speaking before De Jong, Bartomeu reaffirmed what he told ESPN FC in an exclusive interview in April, that he knows where De Ligt will be playing his football next season, but he can't say anything at the moment.
Paris Saint-Germain and Manchester United are already keeping tabs on De Ligt's situation.