He was hailed online for “decent sh*thousery” but many wondered if he took the shirt of the Hammers’ fierce rivals off once he left.

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He was seen leaping with joy in the visiting hordes when Alkmaar nicked a shock lead in the Europa Conference League semi-final first-leg.

But some fans felt it was “karma” when the Hammers revived to win 2-1.

One viewer said: “Fair play to him, but I bet he covers it up outside.”

Another noted how London Stadium is less compact than West Ham‘s old Upton Park ground.

He wrote: “Safe as houses in that soulless hole of a ground now they’ve sold out. Good lad.”

And a few fans even pondered if the supporter was not an AZ supporter, but genuinely a follower of the Lions from South London.

One posted: “Or just a Millwall fan in the Alkmaar end, either way, decent sh*thousery, love it.”

The Hammers’ hopes of a first major trophy since 1980 were rocked when Alphonse Areola fumbled in Tijjani Reijnders’ low shot on 41 minutes.

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But ex-Brighton star Mat Ryan turned the tide with a completely different type of goalkeeping howler.

The Australia captain recklessly punched Jarrod Bowen in the face when challenging in the air – as the England winger headed over.

Said Benrahma’s resulting penalty levelled it, before Michail Antonio pounced on a rebound for the West Ham winner.

One fan responded by saying of the wrong-shirted Alkmaar backer: “He ain’t dancing now.”