Fans had to be separated after clashing in the stands at Eden Park during the British and Irish Lions' 22-16 defeat to the Blues in Auckland.
Warren Gatland's men slumped to their first loss of the 10-game tour, with the tourists conceding three tries and crossing the whitewash just once themselves, debutant CJ Stander scoring their only five-pointer.
But images have surfaced of one supporter wearing a Lions branded polo shirt with two cuts on the right side of his face involved in a scuffle with two other men.
There were no reports of arrests at the 50,000-seater stadium.
"All of a sudden he was involved in a struggle, and punches were flying," an eye witness told New Zealand website Stuff .
"There was beer flung at them as they were scuffling. Loads of people around were quick to try and stop the fight. It was over pretty quickly, but it looked pretty nasty."
