Johnny Tuivasa-Sheck has joined his brother at the Warriors for 2018, but not on a playing contract.

The younger sibling of Warriors captain Roger Tuivasa-Sheck and a former under-20s star at the Roosters, Johnny has been hired in a fan engagement role where the Auckland outfit hope to make the most of of skills in front of, and behind, the camera.

While Warriors chief executive Cameron George has 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.

A call-up is not out of the question, but as he is not part of the club's top-30 squad or one of their six development players, it would take a very special set of circumstances for that to happen.

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"Johnny has been employed by the club in a capacity of fan engagement in community, we then have sought permission from the NRL for him to be available to play ISP," George said.

"We had to go to great lengths to prove that his role with the club is very genuine, which it is, so we got that approval. We don't want to stand in the way of his football career but there are certain conditions around what it looks like in 2018."

A powerful outside back capable of playing multiple positions, Johnny is sure to be an asset for coach Tony Iro's reserve grade squad.

Like his brother, he made a name for himself in the Roosters' under-20s side, scoring 29 tries across two seasons in the NYC, including a spectacular match-winner in the 2016 grand final win over the Panthers.

Johnny began the year training with the Sydney club's full-time squad but found his path to first grade blocked and was released at the end of the season.

Despite having yet to make his first grade debut, he already has a huge following courtesy of his entertaining video skits, which he films and edits himself.

His Facebook page has more than a 130,000 followers and is up to almost 80,000 on Instagram.

His role at the Warriors gives him the opportunity to gain experience in a career he is most likely to pursue post-football, while at the same time push for a first grade contract in 2019.

"He was released by the Roosters, he was over here and to his credit came in and had a chat with me," George said. "Straight away you can see he's going to add benefit, particularly to our community programmes and fan engagement. He's a terrific guy and has very good skill in that area."

Johnny arrives at Mt Smart with Roger off-contract at the end of 2018.

But George said the decision to hire him has nothing to do with their efforts to re-sign the Kiwis fullback.

"Roger's decision will come in due course and this is totally unrelated. It's about Johnny and an opportunity for the club to get better in certain areas."