According to Romano, Onana has reached an agreement with Man Utd on a 5-year deal. It may be a "4+1" deal.
Romano:
More on André Onana. Agreement on personal terms with Man United is on five year deal — likely to be four year contract with an option for further season. 🔴🇨🇲 #MUFC
The player has already accepted Man Utd days ago and he’s ready for this new step, waiting on clubs.