Arsenal were knocked out of the 2017/18 Europa League after going down to a 1-0 defeat at Atletico Madrid, losing 2-1 on aggregate.
REPORT: No fairytale ending for Arsene Wenger as Gunners dumped out of Europa League
To make matters worse, it was old foe of the Gunners Diego Costa who got the winning goal in the second leg game.
Costa would frequently terrorise Arsenal defences in his days at Chelsea and it appears he hasn't lost the knack after producing a neat finish just before the break.