Umtiti is now with the France squad ahead of the World Cup and scored the opening goal in Friday's 3-1 friendly victory over Italy.
Umtiti has featured 79 times for Barcelona since arriving from Lyon in 2016.
Manchester United may have boasted a statistically strong defensive unit this past season - they conceded the second fewest goals in the Premier League - but the second half of the season saw them pose a vulnerable look at the back.
Josep Maria Bartomeu and Samuel Umtiti are now holding a press conference to give more details on the French defender's new contract at Barcelona which will run until 2023. With the city and the team, I've earned everyone's trust.
Today the Frenchman signed the contract and Barca president Josep Maria Bartomeu confirmed his new release clause saying, "Samuel's new release clause stands at €500 million".
Umtiti will then give a brief press conference at theRicard Maxenchs press room at 10:30am before rejoining the France squad for their World Cup preparations.
Sergio Busquets is also in line for a new contract but Barcelona will now turn their attention to bringing in new players.