It leaves the 28-year-old code hopper just three more games against world-class opposition on Sunday to show coach Ben Ryan he deserves a place in Fiji's 12-man Olympic squad.

Fiji didn't need Hayne's barnstorming brilliance to wrap up a back-to-back World Rugby Sevens series triumph.

Big wins over Wales and Australia, following an upset loss to England, secured Fiji a quarter-final berth and put them out of reach of second-placed South Africa in the overall standings.

Hayne was only used sparingly, with Ryan admitting the ex-San Francisco 49er has a long way to go before reaching optimum fitness.

He managed four-and-a-half minutes in the loss against England, touching the ball just once. He had less time but more involvement against Wales, before a brief cameo in the last minute against Australia where he gave away a penalty.

"It's not about game time it's about going out there and doing a job for the team," Hayne said.

"That was a good learning curve and when you're rucking and trying to ruck the ball obviously you exert a lot of energy.

"It's so much faster, it's a lot quicker, (I'm) still getting used to it. I'm just being a sponge and learning as much as I can."

Ryan conceded Hayne was facing a monumental task to realise his Rio Olympics dream.

He only arrived in London on Monday after walking out of a lucrative contract with the San Francisco 49ers in the NFL and his depleted fitness levels meant Ryan had to nurse Hayne through day one of the London Sevens.

"His fitness is way down on our boys and that's why we're moderating what he's doing, he was pretty sore come Friday after consecutive training in what's been a light week for us," Ryan said.

He said he was "nowhere near a judgement" on Hayne's Olympic credentials.

"I'd be an idiot of a coach if having played five minutes in the World Series I can start to make assumptions on where he can go.

"He's a good footballer but we've got world class players, we're the reigning world champions," Ryan said.

"It's huge competition and sevens is our game in Fiji so to get into our side you've got to be absolutely blitzing it and from him that's going to mean going from a yoyo test which they all do in NRL from a 16, where he is now, to a 22.

"When we go into the Olympic camp there's no hiding place, we don't pick by face we pick by form and he'll have six or seven weeks to prove himself.

"If he gets into our side because of form in seven weeks time then he's done remarkably well and if he doesn't it just shows the quality we've got," Ryan said.

AAP