The Italian striker is the third United player to make the switch to St. Andrew's, following the deadline day arrivals of Tyler Blackett
and Tom Thorpe
The 22-year-old Rome-born front-man has been with the Red Devils since 2008 and has made 36 appearances for his parent club to date.
Over the past five years the former Italy U21 international has spent time out on loan with Sampdoria, Queens Park Rangers and VfB Stuttgart. Most recently he was at Sky Bet Championship side Doncaster Rovers, where he made 15 appearances and scored three goals between last September and 1 January this year.
Kiko, as Macheda is nicknamed, is a powerful striker with excellent positional sense and has a clinical finish.