A man arrested at Beyonce and Jay Z's concert in California on Saturday (02Aug14) has pleaded not guilty to biting off another reveller's fingertip during a nasty brawl.

Roberto Garnica, 25, was arrested at Pasadena's Rose Bowl after allegedly clashing with the victim's girlfriend, which sparked a fight, according to Los Angeles County prosecutors.

Authorities say that during the altercation, Garnica punched the man and then bit off the tip of his left index finger.

On Tuesday (05Aug15), Garnica pleaded not guilty to charges of mayhem, battery and battery with serious bodily injury.

If convicted, he could face up to eight years in prison.