The 26-year-old posted two videos and a photo on Instagram of his time on the hill, booing the Melbourne Storm and showing his support for the Sharks.

"Being a Fan for a night. I got them all. No1 new it was me lol best time on the hill. #undercoverfan #bestever," Fifita posted on one video.

"I'm deep right in the crowd," Fifita was heard saying in the video.

"My favourite crowd in front of the Hog's Breath sign. All my boys, I love them. So I thought I'd join them."

Fifita also posted another video of him booing the Storm as they ran out on the field and was heard screaming "yeah" when the ground announcer read out hooker Michael Ennis' name.