Roger Tuivasa-Sheck of the Roosters may be making a move back to Auckland.

The Warriors are set to swoop on Roger Tuivasa-Sheck with the Kiwis and Roosters fullback on the verge of signing a deal upwards of $800,000 per season to join the New Zealand NRL club from next year.

The contract offer was understood to be almost double that of the Roosters, who have offered about $400,000 a year to keep the Kiwi international at the club. The move is almost certain to signal the end of Sam Tomkins' two-year stint at the Warriors with the Englishman set to return to the Super League next year because of his homesick partner.

It comes as a cruel blow to the Roosters who have groomed Tuivasa-Sheck to be the club's long-term fullback following the retirement of Anthony Minichiello at the end of last year. The injured Blake Ferguson shaped as a potential No 1 for the Roosters beyond this year.

The Warriors have struggled to attract big name players to the club after missing out on luring the likes of Kieran Foran, Trent Merrin and Jason Taumalolo to the club for next season.

Tuivasa-Sheck has been in scintillating form for the Roosters this year. He became just the 13th player in the NRL to run for more than 300 metres in a game during the Roosters' loss to the Sharks at the weekend.

The fleet-footed 21-year-old finished with 300 metres from his 28 runs which included two line breaks, six tackle breaks and a long range try.

His younger brother Johnny – who is also an outside back - is part of the Roosters under-20s team and played in the club's premiership winning under-18 SG Ball side last year.

The Roosters will now turn their attention to signing Ferguson on a long-term contract while they also have representative outside backs Daniel Tupou and Shaun Kenny-Dowall off-contract at the end of this season.

The Roosters have secured forwards Dylan Napa and Jared Waerea-Hargreaves to long-term contracts. Five-eighth James Maloney is also off-contract at season's end. Tuivasa-Sheck has played seven tests for the Kiwis since making his NRL debut in 2012.

Tuivisa-Sheck said he had taken time to adjust to the full-time fullback position.

"Usually when I was on the wing I'd be running between six to seven kilometres a game," Tuivisa-Sheck said in March.

"I had to lose a bit more weight to run around. Last year I was playing at 95-kilograms to 97kg. This year I'm back down to 92 or 93kg to try and cover the field more.

He has scored 18 tries from 62 games and was part of the club's 2013 grand final win against South Sydney in his first full season in the top grade.

Last month Roosters CEO Brian Canavan said he knew the Warriors were interested in the fullback.

"We're not aware they have made an offer but we are aware of their interest as well as another club as well," Canavan said at the time.

"We're very keen to retain Roger and we're in discussions now. Whoever else is in there doesn't concern us."

Negotiations between the player's management and both clubs have continued since then and it's understood that Tuivasa-Sheck has discussed a move to the Warriors with his Roosters team-mates. An official announcement from either the Roosters or Warriors is expected soon.