Favourites Manchester United take on Celta Vigo while Ajax will be up against Lyon in the UEFA Europa League semi finals.
In the quarter finals, United beat Anderlecht 3-2 on aggregate over the 2 legs. Marcus Rashford scored an extra-time winner as Manchester United moved into Europa League last four after beating Anderlecht 2-1 with a 3-2 aggregate win.
Lyon beat Besiktas 7-6 on penalties after the second leg ended at 2-1 (Aggregate 3-3). Despite losing 3-2 in the second leg, Ajax went aheahd on 4-3 aggrgate over 2 legs.
Also read: Manchester United enter Europa League semis, suffer Zlatan Ibrahimovic blow
Celta Vogo also drew 1-1 with Genk and went ahead on aggregate of 4-3.
The first legs will be on Thursday 4 May, with the returns scheduled for the following week.
Thh finals will be played on Wednesday, 24 May at the Friends Arena in Solna, Stockholm.