MARK LeCras will spend some weeks on the sidelines after re-injuring his right forearm in West Coast's 25-point win over St Kilda on Saturday night, according to Adam Simpson.

LeCras was subbed off during the opening term after having his right forearm assessed by the Eagles medical staff.

It is the same arm he broke in round one last season against Fremantle. LeCras missed round two as a result and returned in round three but was hampered throughout the year.

Simpson says the Eagles are unsure of the damage LeCras has done and he will be sent for scans on Sunday.

"It could be the same issue he had in the past with his arm," Simpson said.

"We don't know yet. It doesn't look great.

"He'll miss weeks."

Simpson says the loss of LeCras so early in the match really exposed the Eagles structure.

"It probably tells you a bit about playing so tall sometimes," Simpson said.

"If you lose someone like LeCras, the balance goes out of whack a little bit.

"(Will Schofield) came on and did a serviceable job but he's not a forward so we had to adapt to the game."

Simpson believes Josh Hill could be an option to replace LeCras after kicking three goals for East Perth in the WAFL on Friday night.

"He's dying for a chance so you'd assume he'd be in the mix this week," Simpson said.

"He had a really good performance at East Perth last night. We'll see how it all settles tomorrow and we'll go from there but we've got some options."

The Eagles suffered further injury troubles throughout the night. Chris Masten suffered a nasty cork that diminished his running capacity. Scott Selwood also rolled his ankle.

"He couldn't feel his right foot after half-time," Simpson said.

"You probably noticed he kicked one out on the full and pulled a few kicks on his left as well so we thought it was a really brave effort from Scooter."

Sharrod Wellingham was also a late withdrawal before the match. He was replaced by Will Schofield but Simpson believes Wellingham will be fine for next Saturday night's clash with Geelong.

"He's just a bit sore and we left it right until today and he just wasn't quite right and these days you can't play at 90 per cent," Simpson said.

"We considered making him sub but we though the best way forward was just to give him a rest so he'll be available next week."