Everton have just knocked Chelsea out of the FA Cup, but everyone's talking about Diego Costa

Chelsea have just been knocked out of the FA Cup by Everton, thanks to two brilliant goals from Romelu Lukaku.

Chelsea have just been

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But everyone is talking about one incident in the game involving Chelsea's Diego Costa.

After the Spanish striker was tackled by Gareth Barry, he took offence and leaned in towards the English man.

The cameras seem to have picked up on Costa "biting" the Everton man, something we're sure the FA will look into.

Whatever it was, fans did not approve.

That's a BIT naughty from Diego Costa

— Ele Costello (@EleCostello7) March 12, 2016

Diego Costa is an absolute nutcase

— Nikola Bačko (@NikolaBacko) March 12, 2016

Others were reminded of another player who liked a bit of a nibble on the pitch.

Diego Costa is the new Luis Suarez

— Jordania (@SeguraBerenice_) March 12, 2016

Liverpool fans couldn’t resist having their say, of course.

Costa was sent off and some were amazed that it was his first red card as a Chelsea player.

Wow Diego Costa gets his first red in a Chelsea jersey, what an innocent young man #Everton #Chelsea #FaCup

— FΛDƐD_ JДУФL (@JAYTruj) March 12, 2016

Not everyone was convinced it was a bite, though.

This is how I saw Costa v Barry pic.twitter.com/7aVLtnngQ1

— Saj Chowdhury (@SajChowdhury) March 12, 2016

Costa "What aftershave is that Gareth"?

Barry "Hugo Boss mate"

Costa "Bloody lovely"#CFC#EFC pic.twitter.com/Z3O5Xqd0sl

— Steve (@TheoHector2018) March 12, 2016

Bite or not, he’s certainly a complicated and divisive figure.

Diego Costa is well on the way to being a degree course.

— Paul Hayward (@_PaulHayward) March 12, 2016