The 29-year-old midfielder has signed a five-year deal with the Red Devils, days after Andrey Santos joined the club, and he is determined to help the club do better and compete with the world's best once again.
He said: “It’s hard to describe just how proud I am to join Manchester United. Signing for such a special club feels incredible, it is the culmination of years of dedication since I first fell in love with football.
“I have had the privilege of experiencing success in the game and it has only increased my determination to achieve more. The ambition from everyone at the club is extremely clear; we are all determined to push for the biggest trophies over the coming years.”
United are thrilled to have secured the player, who has signed from Aston Villa for around £35 million.
Jason Wilcox, United’s director of football, said: “Youri has consistently been one of the most outstanding midfielders in the Premier League throughout the past seven years. He has all of the technical qualities, as well as the ambition and mentality, to thrive at Manchester United.
“Youri’s consistency is exceptional and he will add further composure, creativity and leadership to our squad. We are delighted to welcome a player of his influence and experience, both on the pitch and within the dressing room, as we continue to build a team ready to challenge for the biggest honours.”
As well as the midfield pair, United have also signed Karl Darlow to provide competition for current number one Senne Lammens. The goalkeeper was a free agent after leaving Leeds in June.