There are three possible outcomes to Tuivasa-Sheck's decision beyond the end of his current contract in 2018 - a) he stays with the Warriors, b) he remains in the NRL but returns to Australia, or c) he follows a long-held All Blacks dream.
If he was forced to decide in September last year, the decision would have been easy.
After a train wreck of a season at Mt Smart, where he had to front up almost every week to explain the failings of the team he led, it would be hard to imagine Tuivasa-Sheck contemplating another Warriors deal.
The Rugby League World Cup campaign provided some respite, as Tuivasa-Sheck rediscovered his mojo, despite the Kiwis' ultimate failure.
He returned to the Warriors' fold in early January, and has been reportedly heartened by what he has seen, especially with the attitude shown by the younger players and the progress made under new physical trainer Alex Corvo.
The Warriors will also make an extremely attractive offer to Tuivasa-Sheck, considerably more than he could earn in rugby, given the current constraints.
But will it be enough?
The NRL want to get the situation resolved as soon as possible, to avoid a repeat of last year's Kieran Foran fiasco which compromised the start of the season, but Tuivasa-Sheck is in no hurry.
He wants to assess — as much as possible — where the club is heading before committing to another deal.
And rugby does hold appeal.
There's a lot more travel, even at Super Rugby level, it's not as physically demanding as league and Tuivasa-Sheck has a background in the sport.
The Blues are the logical choice, given Tuivasa-Sheck's extended family, and his partner's family all reside in the Queen City.
But it's not the only option, and a route into the All Blacks would appear more straightforward via the Crusaders, Hurricanes or Chiefs.
"At the end of the day New Zealand Rugby is aware that in Roger's head, rugby is an option, but we have not engaged with them at all," said Sharrock.
"I've said, at the appropriate time, if he gets to the point he wants to explore it, I'll be knocking on their door."
Rugby also holds some risk.
While Tuivasa-Sheck could go on to become one of the all-time greats in league — and he has already achieved a lot — he would be starting from a blank canvas in union, though his raw talent and training ethic is indisputable.