The Warriors have been dealt a blow with lock Simon Mannering likely to be ruled out of Saturday's NRL clash against Penrith after suffering a hamstring strain at training today.

The 30-year-old is understood to be facing up to two weeks on the sidelines and is also set to miss next week's clash against St George Illawarra in Hamilton.

Coach Stephen Kearney will need to re-jig his line-up with abrasive forward Ligi Sao and young back-rower Bunty Afoa among the extended reserves in the 21-man squad named yesterday.

The loss of the former Kiwis captain comes just after the side was approaching full strength with former New Zealand test prop Ben Matulino having made his first appearance of the season off the bench in their last-start 14-13 win over the Sydney Roosters.

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The 11th ranked Warriors have four wins from nine starts and head to Sydney looking to for back-to-back victories for just the second time this season.