Patrick Dorgu is expected to be at Old Trafford on Sunday after completing his £25.2million move from Lecce.
The 20-year old flew into Manchester on Saturday to undergo his medical and has agreed a five-and-a-half year contract.
He will become Ruben Amorim's first signing and will be in the stands for the game against Crystal Palace.
Amorim identified Denmark international Dorgu as a player who can fit in as an athletic left wing-back who can also fill in at left wing or on the right hand side.
United are also adding Arsenal centre back Ayden Heaven.