The club's final Serie A game of the season against Torino will take place on Friday 20 May.
Kick-off at the Stadio Olimpico Grande Torino has been confirmed for 20:45 CEST.
The decision means Jose Mourinho's squad will have four full days of preparation prior to the final of the Europa Conference League, which takes place on May 25 in Tirana.
The Giallorossi know a victory in Turin will ensure European football for next season, regardless of results elsewhere.
The winners of the Europa Conference League also gain an automatic place in the group stage of next season's Europa League.