West Coast coach John Worsfold has likened midfielder Daniel Kerr's hamstring concern to that of forward Jack Darling earlier this season and is yet to rule him out of Saturday's western derby.
But fitness clouds continue to gather around the Eagles as they try to muster resources for their run at a top-four finish.
Fremantle coach Ross Lyon, meanwhile, has flagged the possibility of a team unchanged from the one that won the club's fourth game in a row, downing Port Adelaide last Sunday.
However, ruckman Jon Griffin looked sore during a brief training session at Fremantle Oval yesterday.
Kerr, ruckman Dean Cox and midfielder Luke Shuey were significant absentees as the media watched the start of an Eagles training session yesterday.
Cox, like Kerr, was injured last Sunday.
Shuey was seen heading into Patersons Stadium late with what appeared to be medical scans, though a club spokesman said he was expected to play.
Earlier in the day, Worsfold had told a media conference that training runs yesterday were to have a significant bearing on whether Cox and Kerr would face the Dockers.
Kerr was subbed out by the Eagles against Brisbane on Sunday after half-time after pulling up short, concerned about his left hamstring.
He has since said that scans have shown a small amount of muscle bleeding.
Darling was subbed out of the round-16 loss to Sydney with a tight hamstring, but managed to play against Adelaide the following week because the club believed he had suffered a cork.
Sources yesterday indicated Kerr was a 50-50 chance to play in Patersons Stadium's latest derby.
"He's OK," Worsfold said. "But there's a fair bit of work to do today whether he's going to play or not. He's certainly not ruled out and we'll see how he feels when he runs around today. His first test will be what he does today.
"We won't take any risks with him." Cox rolled an ankle against the Lions but managed to play the game out after getting treatment.
Worsfold named Jacob Brennan, Ashley Smith, Mitch Brown and Lewis Stevenson as contenders to replace the suspended Darren Glass.
Lyon said a persistent strain of the flu doing the rounds at the Dockers represented their main concern at the moment. Clancee Pearce was the only player from last weekend's 22 to miss a short, light training session yesterday. The Dockers are expected to train fully today.
Griffin, who received a knock to a knee last weekend, was suffering from "a few bumps and bruises" but was fine, Lyon said.
He said his club had been dealing with the flu strain since round 14.
"You just keep your fingers crossed. Different players have an ability to carry it really well, and others have to shut up shop," he said.