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.

Kerr was due to resume this week after serving a three-match suspension for headbutting Bulldogs veteran Scott West in round six.

Captain Darren Glass will have a light week on the track after picking up a knock to his leg on the weekend but Sumich said the key defender would be right to go against the Pies.

Sumich said Ashley Hansen, who kicked five goals for WAFL side Swan Districts on the weekend, would battle to break back into a West Coast side buoyed by Saturday's 50-point win over Adelaide.

But injury-plagued midfielder Sam Butler, who has not played since the Eagles' 2006 premiership triumph over Sydney, will come under consideration after an uninterrupted five-week stint in the WAFL.

Meanwhile, Sumich has come up with a radical idea to avoid a repeat of the interchange officiating bungle that cost the Eagles a goal against the Crows.

"We might get a scanner and a barcode on the jumpers and then probably just stand there and scan the jumper," he joked.

"I know it sounds funny but it might be the way to go. Like at Woolworths or Coles."

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