Umtiti signed for Barcelona on a five-year contract in a €25 million deal from Lyon.
At just 22 years old, Umtiti has already made 170 career appearances in club football and won three caps for his country.
At his official unveiling, Umtiti said: "I'm thrilled and very moved to be here.
"This is a dream come true. Barca was the club of my dreams.
"There are great players at this club and I can't wait to play with them".
According to Barcelona sporting director Robert Fernandez, Umtiti was in high demand with a number of Premier League clubs interested in the young defender.
"We followed him last season and we really liked him," he said
"It was not an easy negotiation as there were English clubs interested in him.
"Umtiti is a young player, who can play in different positions and despite being left-footed, he has proved he can play on the right".