Kevin completed the shock move from Sassuolo on Monday night, becoming the first Ghanaian to represent the Blaugrana.
The 31-year-old has been recruited for the remainder of the 2018/19 season.
The initial deal cost Barcelona around €2million (£1.8m) with another €8m due if Barca wants him on a permanent contract.
And in his first interview as Barcelona player, Kevin said: "I'm very happy. It is a big honour to be here, having the possibility to play for this great."
"Every kid who starts to play for football it's a big dream to play in a club like Barcelona so for me it's a big dream coming through."
The former AC Milan also vowed to give his all for the club.
"I will just try to give everything to this club. I think everybody knows the way I play and my strengths."
Boateng only joined Sassuolo in the summer and has scored four goals in 13 Serie A outings, recently playing in a more advanced role.
His previous spell in La Liga was a successful one, Boateng scoring 10 goals in 28 appearances for Las Palmas in 2016-17 before leaving for Eintracht Frankfurt.
Boateng has also played for Hertha Berlin, Borussia Dortmund, Schalke, Tottenham, Portsmouth and Milan. Read Full Story
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