Warriors fullback Sam Tomkins is in doubt for Saturday's showdown with the Broncos after straining a hip flexor at training today.

The 25- year-old import has been in strong form as the team have found some momentum to sit sixth on the NRL ladder.

Tomkins scored two of the side's eight tries in their 48 nil romp over the Eels at Mount Smart at the weekend.

Coach Andrew McFadden remains confident the Englishman will be fit, but it could be a game time decision.

"He's got a bit of a mild hop flexor strain or tightness, we're not quite sure how bad it is at the moment, so hopefully he's right for the game on the weekend, but we'll just have to wait and see."