After a string of failed bids for the Liverpool playmaker in August, Barca have agreed to pay a reported club-record fee of €120m for the Brazil international, who signed a five-and-a-half-year deal at Camp Nou.
In its official statement, FC Barcelona reports that it has reached a transfer agreement with Palmeiras for €11.8 million.
Barcelona has been using Thomas Vermaelen alongside Gerard Pique in the middle of the defense, with veteran Javier Mascherano as their backup.
Barcelona sign centre-back Yerry Mina early
Catalan giants are reportedly closing in on the 18-year-old EC Vitoria starlet Luan who's been one of the biggest revelations in the Brasileirao this season.
The Colombian will wear the No24 shirt and follows the £145m deal for Philippe Coutinho made last week.
Umtiti has also been linked with a transfer away from Barcelona, with Manchester City and Manchester United among the clubs linked with triggering the France centre-back's €60m release clause. Barcelona said the match served as a trial for Mosquera, who did not join the club.
Manchester United face a battle to convince Antoine Griezmann to join them, with Barcelona considered favourites to land the Atletico Madrid star, according to ESPN .