After nine enthralling rounds of the HSBC World Rugby Sevens Series, the season reaches its climax this weekend. On the eve of the HSBC London Sevens at Twickenham the final squads have been confirmed for the 16 competing teams.

With much talk about Jarryd Hayne since his move from the San Francisco 49ers to join up with the series leaders Fiji this week, the former NRL and NFL star comes in as a late injury replacement alongside Masivesi Dakuwaqa, replacing Vatemo Ravouvou and Pio Tuwai who were ruled out by the Tournament Team Doctor.

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Fiji, who make three changes from the side that lost to Samoa in the final of the HSBC Paris Sevens, need just eight points to claim the series title which they would secure by booking their place in the Cup quarter-finals on day one.

"I think with the Olympics coming up, and also the curiosity to playing the game, being half Fijian it (rugby sevens) is something I've followed since I was a kid," said Hayne.

"My Dad is Fijian and we watched a lot of Serevi games, and William Ryder was a big idol of mine. I have always dreamt about playing sevens for Fiji and I've been given the opportunity.

"It is a team that plays with a lot of spirit and a lot of faith. You don't really see that in teams around the globe. I've played for many different teams at the highest level and Fiji is a special nation and a special country to play for."

Ryan added: "We always had a plan to mix things up. We got to this point as a team, psychologists talk about this, and we were at a point where I just saw a little bit of halting, we weren't still picking it up. I thought the boys needed a bit of added competition and that came from France, and it has also come from San Francisco.

"Jarryd is our latest, he has trained well, (it's a) massive learning curve for him but he has settled in well and he is used to that Fijian side of things off the field when he was with Fiji Bati so that hasn't been an issue at all. He brings a professionalism obviously, and we already have that. We have boys that are at that level where they are self-reliant, self-sufficient and I trust all of them.

"But he comes in from a different angle, he has a great background in rugby league and another professional sport at the highest level. In attack he is comfortable on the ball, he has good spatial awareness and has good footwork. In defence he is a good tackler. It is the shape in defence, the breakdown skills, the finer arts and of course the engine, he is not going to have the same fitness as our boys have got but he's had a good week with us."

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Elsewhere Marcus Watson returns to the England side for the first time this season having been named in the Team GB training squad. They also welcome back Dan Norton, Phil Burgess and Tom Mitchell for their home tournament where they face Fiji, Australia and Wales in a familiar looking pool.

Rugby World Cup 2015 star Juan Imhoff joins Matias Moroni and Santiago Cordero for Argentina, while DJ Forbes misses out on selection for the All Blacks Sevens and therefore remains tied with Uale Mai on a record 79 series events. Tim Mikkelson returns in place of Dylan Collier and will captain the All Blacks Sevens.

One record that could be broken this weekend is that of the all-time top try scorer with Collins Injera of Kenya just three tries behind Santiago Gomez Cora's record of 230. Interestingly Injera scored his 200th career try at Twickenham last year, and also scored his first-ever try in London.