Man Utd are paying Inter Milan an initial fee of €51m (£43.8m), plus €4m (£3.4m) in potential add-ons.
Manchester United released an official statement on their website to confirm the signing of Andre Onana.
“Andre Onana has joined Manchester United on a contract running until June 2028, with the option of a further year, subject to international clearance,” the club confirmed.
“The Cameroonian goalkeeper has kept 104 clean sheets in 255 club appearances. He won three league titles and two KNVB Cups with Ajax before joining Inter in 2022.
“Last season, he won the Coppa Italia and recorded the most clean sheets in the Champions League.”
Onana was pictured at Manchester Airport earlier today ahead of flying out to New York to join his new team-mates for the pre-season tour of the US.