An AZ Alkmaar fan was spotted at the London Stadium sporting a Millwall shirt – and social media loved it.
West Ham managed to come back from a goal down to clinch a 2-1 win over their Dutch opponents in the first leg of their Europa Conference League semi-final.
Tijani Reijnders broke the deadlock at the London Stadium just before the break after a howler from Alphonse Areola.
The midfielder’s effort came from distance and at pace, but the Frenchman got a glove and should have saved it, giving David Moyes problems before half-time.
As BT Sport cameras panned over to the away fans during their celebrations, eagle-eyed viewers spotted one supporter sporting a Millwall top.
The two clubs are famously arch-rivals and it led to quite the reaction on social media.
One fan tweeted: “The kind of pettiness we can all get behind.”
“Hero,” another simply stated.
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A third said: “Good s***housery.”
“Fair play,” this fan posted.
Referring to Millwall missing out on the play-offs. one user quipped: “Hope he enjoyed that result more than the one on Monday.”
The Hammers managed to come back and snatch victory after the break with two late goals, the first coming from the penalty spot.
Former Arsenal loanee Mat Ryan, now at AZ Alkmaar, made the wrong decision when he came out to meet a cross.
Instead of punching the ball, the Australian wallopped Jarrod Bowen in the face, which gave the referee no choice but to point to the spot.
Said Benrahma made no mistake with a brilliant effort that lashed past Ryan to give the Hammers an equaliser.
And moments later they took the lead through Michail Antonio, with the striker on hand to tap in the eventual winner.
Declan Rice sent the ball across the goal that was nodded towards the line by Nayef Aguerd.
After a fine goal-line clearance, Antonio was the quickest to react to net the winner to spark jubilant scenes ahead of the second leg next week in the Netherlands.