German-born Ghanian Boateng is now with Serie A side Sassuolo, having moved last summer from German club Eintracht Frankfurt.
The deal is being wrapped up by Boateng's agent, Edoardo Crnjar.
'Barca, I'm coming! I'm sad to leave Sassuolo but is a great chance, ' the Ghana worldwide told Sky Sport.
"I'm sad to leave Sassuolo but is a great chance".
The attacker also downplayed previous comments made about Barca's rivals Real Madrid.
In a 2017 interview, Boateng answered he preferred Real Madrid to Barcelona.
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"I only want to focus on Barcelona and I hope to score at Bernabeu for the next Clasico".
Barcelona will be Boateng's fourth club in the past three seasons, though the Ghana global has fared well at each of his stops.
Boateng returns to the league where he enjoyed the most prolific season of his career, scoring ten goals for Las Palmas during a one-season stay in Gran Canaria in 2016/17.
The 31-year-old who represented his native country at the 2006 World Cup has scored four goals in 13 appearances for Sassulo this season.
Boateng is Barca's second loan signing in the January transfer window after the club had already brought in Valencia defender Jeison Murillo.
A statement on the Catalan club's website called Boateng "a player who is versatile to a fault".