It's a big ask for the 22-year-old - especially on foreign fields but Tuivasa-Sheck relishes the challenge.
"Its good for Peta Hiku and Tui [Lolohea] to get a run there and show what they have," said Tuivasa-Sheck. "[But] if Issac [Luke] and I have to step up then we will do it."
This time last year, Tuivasa-Sheck was sitting on the sidelines, with Roosters coach Trent Robinson pulling him out of the 2014 Four Nations to enable an entire off season learning fullback.
It was a highly criticized move at the time - and Hiku staked his own claim for the No1 jersey will a series of impressive displays while Tuivasa-Sheck was training with long time Roosters custodian Anthony Minichielllo.
But credit to Robninson, and the man himself, it paid off in a big way. The former Otahuhu Colleage stand out set some records that may never be broken - including running for almost NRL 6000 metres this year, and topping 200m in a game 14 times, smashing Jarryd Hayne established mark.
"Roger has improved as fast as anyone I have seen in that fullback role, "said Robinson. "He's already up there with the best fullbacks in our sport."
"I had to mature myself at the fullback role and I feel like I have done that," said Tuivasa-Sheck. "I'm hungry for more games now."
Tuivasa-Sheck also relishes the prospect of coming up against Steve MacNamara, the England coach who is also one of the Roosters' assistants to Robinson.
""I'm excited to see Steve [MacNamara ]and play against his team," said Tuivasa-Sheck. "With Sam Moa, Issac Liu, Shaun Kenny-Dowall..we have that flair he knows what is expected he just needs stop us. He already knows how the Kiwis play."
Tuivasa-Sheck spent all last week in Mexico relaxing in Cancun along with Roosters teammates and only arrived into camp on Saturday afternoon. But despite a week off, he looked extremely sharp at the Kiwis' first training last Sunday, especially with his ability to appear out of nowhere to run off the shoulder of a teammate.