Gun West Coast on-baller Daniel Kerr is struggling to overcome a lower leg injury and remains in doubt for Saturday's clash with Collingwood at the MCG.

Kerr, who sustained the injury in the opening minutes of the AFL's Hall of Fame game earlier this month, was restricted to light duties at training on Monday.

West Coast assistant coach Peter Sumich said the club's main training session on Wednesday would determine whether Kerr and defender Beau Waters (groin) would line up against the Pies.

"We'll wait until Wednesday and hopefully they'll have a very good session and put their hand up," Sumich said.

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