The two home and away ties would be played with the first leg on April 26 and the return legs on May 3.
The top clash of the Semifinals is former champions Atletico Madrid against English Premier League side Arsenal FC, while in the other tie French Ligue 1 side Olympique de Marseille face FC Salzburg of the Austrian Bundesliga.
UEFA Europa League – Semifinals
Olympique de Marseille (FRA) – FC Salzburg (AUT)
Atletico Madrid (ESP) – Arsenal FC (ENG)