Reports Warriors captain and Kiwis rugby league star Roger Tuivasa-Sheck is looking to switch to union in time for the 2019 Rugby World Cup have been scorned by his agent.

A NZ Rugby deal with Tuivasa-Sheck, who would shift to the Blues, was understood to be "all but done", Radio New Zealand reported on Thursday morning.

Some senior Warriors were aware of the move, RNZ reported, despite the talented fullback not having told the team.

NZR sources have said no discussions had been held, and the fullback would have to take a pay cut to join the code.

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And Tuivasa-Sheck's manager Bruce Sharrock said: "it's another case of journalistic sensationalism and this is one of the reasons why we don't speak to people".

"I can tell you categorically, I've not even spoken to the Blues," Sharrock said. NZR centrally contracts players.

The 24-year-old is off contract with the Warriors following the 2018 season. He is reportedly being eyed as a potential midfielder or outside back in rugby.

Sharrock said they're not yet talking to anyone about where he'll play from 2019.

"There is quite a thorough process for us to go through and we're still doing that," he said.

"We haven't entered discussions with anyone on anything, he's evaluating a whole host of issues and that's what we do.

"What I can say is that the Warriors are certainly high on that priority list to engage with, but there has been no engagement.

"There have been other clubs that have registered interest, but we're just not ready to talk. In order to get any deal done, you've got to have two parties that are willing to bring it to a head.

"At this stage we're not ready. I'm not going to go into the reasons why, they're his private reasons.

"When he's ready to go into negotiations, we will and then hopefully we'll get a deal done and then at the back end you guys will find out it's all done and we'll have no problem talking about it."

He played rugby while at Otahuhu College and was a 2011 New Zealand schools representative before linking up with the Sydney Roosters in the NRL.

He has repeatedly aired a desire to one day return to rugby and chase his All Blacks dream, with reports emerging during last year's Rugby League World Cup that he was engaged in talks with New Zealand Rugby.

Tuivasa-Sheck would find it difficult to contend for a place at the 2019 World Cup in such a short space of time. He would effectively have a single domestic season to force his way into the All Blacks reckoning.

Australian media reports this year have also linked the Warriors star to the South Sydney Rabbitohs from next year.