Emery guided Villarreal on a 19-match undefeated streak after joining the club – a record for the La Liga side – and has them two legs away from a Europa League final against either Manchester United or Roma.
Arsenal will look to reach the showpiece game instead, for the first time since their 2018 defeat by Chelsea, amid speculation over a potential takeover bid from Spotify CEO Daniel Ek and former Gunners Thierry Henry, Patrick Vieira and Dennis Bergkamp.
Here’s everything you need to know about the match:
When is it?
The game will kick off at 8pm BST.
How can I watch it?
The match will air live on BT Sport 3. Subscribers can also stream the action live on the broadcaster’s website and app.
What is the team news?
Villarreal midfielder Vicente Iborra will miss the game due to a knee injury, while Trigueros’ domestic suspension is irrelevant here. Francis Coquelin could be deployed against his old team but is likely to start on the bench.
Arteta has said that Alexandre Lacazette, Pierre-Emerick Aubameyang, Kieran Tierney and David Luiz are all in contention to play this evening despite recent injuries – or illness, in Aubayemang’s case.
Villarreal: Asenjo; Foyth, Albiol, Torres, Estupinan; Chukwueze, Parejo, Capoue, Trigueros; Moreno, Alcacer
Arsenal: Leno; Chambers, Holding, Gabriel, Xhaka; Partey, Ceballos; Saka, Odegaard, Pepe; Lacazette
A cagey first leg, with Arsenal taking the lead but letting the hosts back into the tie late on. Villarreal 1-1 Arsenal.