Reports out of Australia suggest Roger Tuivasa-Sheck could wave goodbye to the Warriors at the end of the season.

Speculation is mounting across the Tasman that Russell Crowe's South Sydney Rabbitohs are chasing one of the New ZWarriors' best players.

Reports out of Australia suggest the Sydney club are chasing the signature of superstar fullback Roger Tuivasa-Sheck.

Tuivasa-Sheck comes off contract with the Warriors at the end of the 2018 season and he is no certainty to stay in Auckland.

GETTY IMAGES Kiwis fullback Roger Tuivasa-Sheck is being linked with a move to the South Sydney Rabbitohs.

Nine.com.au reported on Tuesday that Souths are poised to make an offer for the Warriors and Kiwis test star for 2019 and beyond but are not the only NRL club chasing his signature.

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"The mail coming out of Auckland is that Tuivasa-Sheck isn't happy at the Warriors, where his game has gone downhill since he left the Roosters at the end of 2015," the nine.com.au report said.

The report said the Warriors are desperate to retain Tuivasa-Sheck but unless they can turn around a poor run of form their 2017 captain will look to move to a more competitive club.

The Auckland-based club has not made the top eight since Tuivasa-Sheck's arrival.

A 10th place finish in 2016, followed by an even worse 13th in 2017, is a far cry from Tuivasa-Sheck's premiership victory in 2013 that was followed by two minor premierships (2014-15) with the Sydney Roosters.

The report suggests veteran Rabbitohs fullback Greg Inglis will move into the centres this year with Cody Walker likely to play in the No 1 jersey in 2018 as a stop-gap measure with the hope that Tuivasa-Sheck will fill the position in 2019.

Tuivasa-Sheck has also been linked to a switch to rugby union.

In October last year, speculation was rife that Tuivasa-Sheck would look to change codes and chase an All Blacks jersey but the Kiwis fullback would not be drawn on the rumours during the Kiwis' failed Rugby League World Cup campaign.

Last December, the Warriors signed Tuivasa-Sheck's brother Johnny, a former under-20s star at the Roosters, in a fan engagement role.

While Warriors chief executive Cameron George gained permission from the NRL for the 21-year-old to play reserve grade in the Intrust Super Premiership (ISP), it is extremely unlikely he will get the chance to line up alongside Roger in first grade.