"That's his background, the All Blacks are a world-recognised team with an amazing success rate. If you thought you were good enough to be a part of it, it's not a bad ship to be a part of," Sharrock added.
"He's at a stage in his career where if he is going to [switch codes], it's probably going to be sooner rather than later," Sharrock said. "Not many people can shift later in their career, it makes it very tough."
After signing a three year contract with the Warriors from the Roosters in 2015, Tuivasa-Sheck told Sydney's Daily Telegraph that he turned down a offer from New Zealand Rugby.
"I think it is every Kiwi boy's (dream) to be an All Black and it is definitely mine," Tuivasa-Sheck said two years ago
"Hopefully, one day that dream happens."
"We had a rugby union offer on the table," said the former Otahuhu College flyer.
"It was in New Zealand. I sort of told (his manager) that I feel like I am still growing in league. I feel like I am still to peak.
"I don't want to be the average league player that almost made it. I really wanted to do something in the game."
Former Warriors winger Ngani Laumape made the switch to rugby union in 2016 and made his All Blacks debut this year after a standout season for the Hurricanes.
Former Melbourne Storm player Matt Duffie is set to make his All Blacks debut on the Nothern Tour after making the 37-man squad.
