Arsenal will play Villarreal in the Europa Cup semi-final this season.
The Gunners hammered Slavia Prague 4-0 in the Czech Republic to book their place in the last four.
Mikel Arteta travelled for the second leg with the tie delicately poised at 1-1, but Alexandre Lacazette’s brace and goals from Bukayo Saka and Nicolas Pepe saw them make light work of their task.
Villarreal, coached by former Arsenal manager, Unai Emery, also beat Dinamo Zagreb 2-1. They progress with a 3-1 agregate.
Manchester United saw off Granada, to qualify on a 4-0 aggregate. They face Roma in the semis.
The semi-finals will be played April 29 and May 6.