Onana, who will succeed David De Gea as number one at Old Trafford, has agreed a five-year deal with the Premier League club.
De Gea, left the Red Devils earlier this month after 12 years at United.
The Spaniard struggled with Erik ten Hag’s preference to play out from the back and Onana appeared a far more natural fit for the Dutch coach’s philosophy.
Onana joined Barcelona as a 14-year-old after being spotted at Samuel Eto’o’s academy in his homeland.
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