United is fresh off a heartbreaking elimination from the Champions League less than a week ago.
The club from San Sebastien in Spain finished second in their Europa League group stage behind Napoli.
Domestically La Real (The Royal) are in first in La Liga with seven wins and just one defeat in 13 matches.
It will be a reunion for Adnan Januzaj who made 50 appearances for the Reds between 2013-2017.
The Belgian has two goals and one assist for his new team this season in Spain.
United and La Real have only met twice previously in the 2013/14 Champions’ League group stage.
United won 1-0 at Old Trafford while the second match ended in a 0-0 draw in Spain.
The first leg between these sides takes place on February 18 at Sociedad’s Anoeta Stadium.
The return leg happens at Old Trafford on February 25.
You can view all the Europa League Round of 32 matchups here. (JSL).