Marseille up against Red Bull Salzburg in the other last-four tie
Arsenal face Atletico Madrid in Europa League semi-finals
Arsenal have been drawn with Atletico Madrid in the semi-finals of the Europa League.
Arsene Wenger's side will have to get past the second-placed side in Spain in the two-legged tie if they are to stay on track to win the tournament for the first time. They will have home advantage for the first leg on April 26, before travelling to Spain for the second leg on May 3.
Wenger has not won an European trophy during his time at the London club and that task has become much harder as they face Diego Simeone's side.
Atletico have won the Europa League twice in recent years, in 2010 and 2012, and were Uefa Champions League runners-up in 2014 and 2016.
Arsenal had reached the last four by beating CSKA Moscow 6-3 on aggregate, while Atletico got past Sporting 2-1.
The other semi-final sees Marseille face Red Bull Salzburg.