The midfielder has agreed a four-year deal with the Blaugrana, which was made official on Monday following months of speculation.
Browsing: Franck Kessie
Barcelona have announced their signings on free transfers.
Rossoneri fans were initially unhappy at Stefano Pioli’s appointment in 2019 given he previously managed rivals Inter.
The 2019 champions were completely outplayed in Douala on Thursday, compounding a miserable tournament in which they failed to win a single game.
Milan coach Stefano Pioli made six changes to his starting XI from the midweek victory at Genoa, with the crucial Champions League match against Liverpool in mind.
The 39-year-old Sweden striker was shown a straight red card after an hour for saying something to the referee, with his side 2-0 up.
Thursday’s victory saw the Red Devils advance 2-1 in the tie after the teams drew 1-1 at Old Trafford.