Confirmed: Manchester United get Spanish opposition in Europa League semi-final draw
Celta Vigo knocked out Genk 4-3 on aggregate in the quarterfinal of the competition.
United will travel to Spain for the first leg of the tie on May 4, before hosting the second leg on March 11.
The other side of the competition will see Ajax face Lyon.
Winning the Europa League is a viable for United to make it into the Champions League next season.