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Broncos star Derek Wolfe says someone clocked him with an object -- possibly a bottle -- during that nightclub brawl ... and new video of the incident could back him up.

TMZ Sports just got this new angle of the fight that went down in a Denver nightclub Saturday night. This footage shows more of the fight, and it looks like someone does strike the Super Bowl champ in the head multiple times.

It's unclear what, if anything, was in the attacker's hand.

According to his agent Mike Simon ... Derek "did not provoke the fight. He was trying to protect a friend. His recollection is that he was hit from the back with an object when he wasn't looking."

As TMZ Sports first reported, police were NOT called to the scene during or after the brawl. Witnesses said Wolfe's face was bleeding has he left the club.