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Footage uploaded to Twitter by a Leeds fan shows the officer belting out a chant in support of the Yorkshire club with the match in full flow behind him.

The clip has been seen by more than 800,000 people since it was posted online – even getting a retweet from Match of the Day host Gary Lineker in the process.

“Brilliant,” the legendary England striker wrote.

Others were also full of praise for the policeman, with one viewer tweeting: “This is the way to keep fans onside when being policed at away games.

(Image: TWITTER)

“Sure, there to do a job, but a bit of humour and camaraderie goes a long way. Fair play that police officer.”

Another said: “Hero. Quality policing. Lessons to be learned here.”

“Love it, more Old Bill should be like that,” added a third.

Unfortunately for the policeman, Leeds were eliminated during an entertaining third round tie against the Welsh League Two side.

(Image: GETTY)

Gaetano Berardi's deflected opener had put Leeds ahead in the first half, sending the travelling supporters into euphoria.

But Shawn McCoulsky's 89th minute header and Conor Shaughnessy's own goal put Newport into round four for the first time since 1978-79, completing a deserved comeback.

Speaking after the match, Newport manager Michael Flynn made it clear who he would like to draw in the fourth round of the fabled competition.

"I would love Liverpool at Anfield: that would be the dream for me being a Liverpool fan," he said.

The FA Cup fourth round draw takes place at 7pm on Monday (Jan 8).