Roger Tuivasa-Sheck knew he was in serious trouble after injuring his knee against the Bulldogs.

Losing star recruit Roger Tuivasa-Sheck might shock the Warriors into action.

That's the theory of Australian World Cup winner and NRL grand final winner Matthew Johns.

Johns aired his thoughts on his Monday Night with Matty Johns TV show in Australia, just hours after the Warriors confirmed Tuivasa-Sheck would miss the rest of the season with a serious knee injury suffered in last Saturday's win over the Bulldogs.

The Kiwis fullback was making pleasing progress with the Warriors after shifting across the Tasman from the Roosters as one of their major signings for the 2016 season.

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The Warriors have had a patchy start to the year and had huge hopes of Tuivasa-Sheck taking them to another level.

Johns believes that could still happen without him.

"I've got a feeling it might trigger something in the side. I think they've been playing too comfortable," Johns told Monday Night with Matty Johns.

"At the moment they've got a feeling like they can turn it on at any point, and this might just be a shock to the system."

Johns believes Tuimoala Lolohea is the Warriors' best answer to filling Tuivasa-Sheck's boots at fullback.

After being moved from the wing to five-eighth for the 24-20 win over the Bulldogs in Wellington, Lolohea slotted in at the back when Tuivasa-Sheck was forced off.

Lolohea impressed after the switch, scoring a crucial second-half try, and Warriors assistant coach Justin Morgan told Radio Sport the young utility would most likely take over the No 1 jersey.

"It's difficult because everyone knows the salary cap is so tight so what we've got is basically what we've got to go with," Morgan said.

"Trying to be optimistic, [Tui] had one of his strongest games at fullback for the last 60 minutes of the game against the Bulldogs. His game naturally suits [fullback] because he is a runner and he can swing either side of the field.

"The positive is we have a pretty good replacement there. Roger is world-class, but Tui has proven in the last season or so that he is an up-and-coming player on the international stage."

It would not be the first time Lolohea has filled in at fullback for an extended period after an injury to a big signing.

The 21-year-old started a number of games there last season in the absence of injured and now-departed English star Sam Tomkins.

Lolohea's shift to fullback would probably mean veteran Thomas Leuluai, who made his second appearance on Saturday from an 11-month injury layoff, would play alongside Shaun Johnson in the halves, Morgan told Radio Sport.

"Even though [Leuluai] has only been back for a couple of games, he's really experienced and is most suited to that left-hand side of the field because he plays really directly. That will help Ryan Hoffman, who is the back-rower on that side, get some one-on-ones with opposition defenders.

"We are trying to be optimistic and the bottom-line is we just have to get on with it. We can be upset all we like, but we can't just kiss the season goodbye because we've picked up a couple of injuries."

The Warriors play the Storm in Melbourne on Monday night.

The Warriors are 11th on the points table with three wins from seven matches. The Storm are fifth, having won five games.

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