Australian halfback Josh Holmes warned Fiji recruit Jarryd Hayne that it wasn't going to be easy, and he was proved right as the former San Francisco 49er made his much-anticipated sevens debut in London on Saturday night.

Having been named on Friday in Fiji's 12-man squad, stepping in for injured playmaker Vatemo Ravouvou, Hayne got his first slice of the action with four and a half minutes remaining in the second half of his side's opener against hosts England at Twickenham.

His first involvement was over before it started, as he bought a dummy on the left wing before the ball ultimately went to ground from Oliver Lindsay Hague.

He received the ball only once in his cameo, taking it on the Fiji line under the posts, before passing and wrapping around for the return from Samisoni Viriviri - which was intercepted for a try for Tom Bowen.