Wests Tigers forwards Todd Payten and Bryce Gibbs are struggling to be fit to play in Friday night's crucial NRL match against St George Illawarra.

Payten and Gibbs both have hamstring injuries and were put through searching fitness tests on Friday morning.

Tigers officials will wait to see how the duo pull up on Friday before making a final decision on their availability.

Halfback and skipper Robbie Farah declared himself a certain starter despite an ankle injury keeping him off the training paddock until Thursday.

The Tigers desperately need a win to keep in touch with the finals contenders while the sixth-placed Dragons could drop out of eighth place with a heavy loss.

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