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The harrowing clip shared hundreds of times online shows fans from both sides come to blows in the streets of Glasgow.

Yobs throw punches, flooring each other, and pick up and destroy signs to use as weapons.

One savage thug swings part of a white sign at a furious Celtic fan, who reacts by repeatedly thumping his foe.

(Image: TWITTER / CASUALSATURDAYS) (Image: TWITTER/CASUALSATURDAYS)

Meanwhile, other hooligans are seen grappling in the middle of a road until one is shoved aggressively onto the pavement.

The Celtic supporters are eventually led away as the scuffle simmers in the shocking 42-second clip.

The cup match ended 1-0 to Celtic after former Fulham striker Moussa Dembelé scored a late winner.

It's the second time the two sides have met in two months after Celtic thumped their rivals 5-1 in September.

It comes after a mass brawl erupted outside West Ham United's new London Stadium last month.

Fans have been filmed scrapping inside the £486million arena on a number of occasions this season.

A Police Scotland spokeswoman said: "There were 18 arrests in and around the stadium by approximately 5.30pm today."