Roma and Villareal won't fear either.
Manchester United and Arsenal are in Europa League action tonight at the semi final stage.
United's first leg is against Roma at Old Trafford and Anthony Martial is unavailable.
Arsenal are in Spain to face Villarreal - who are managed by the former Gunners boss Unai Emery.
Pierre Emerick Aubameyang and Alexandre Lacazette should be fit for Arsenal.
Both games kick off at 8.