'Barca, I'm coming! I'm sad to leave Sassuolo but is a great chance, ' the Ghana worldwide told Sky Sport.
Barca's move for the Ghana global comes as a shock given the midfielder's stature in the game, having represented fairly modest clubs in Las Palmas, Eintracht Frankfurt and Sassuolo over the last few years.
In a 2017 interview, Boateng answered he preferred Real Madrid to Barcelona.
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However, the 31-year-old Boateng says his focus is on his new club, and aiming to find the net against Real Madrid when the two sides next meet in the Spanish capital on March 2.
Barca now sit five points clear at the top of the Liga table and 10 points ahead of third-placed Real Madrid.
Since then, he's represented Schalke, Milan (again), Las Palmas, Frankfurt and Sassuolo, who he joined last summer.
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Boateng has scored five goals in 15 appearances for Sassuolo, who he joined in the summer, and has previous experience in La Liga where he was more prolific.
Along with Jeison Murillo, he is Barcelona's second signing of this January transfer window and he also becomes the second arrival over the age of 30 this season, accompanying Arturo Vidal.
It is unlikely Boateng's signing will be finalised in time for him to play against Sevilla in the first leg of Barca's Copa del Rey quarter-final on Wednesday, meaning he could make his debut on Sunday against Girona.
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