West Coast have not ruled out the possibility of sending Daniel Kerr in for a series of blood tests after the star midfielder struggled through Saturday's 13-point AFL western derby loss to Fremantle.

Kerr, who collected just 16 possessions for the game, cramped badly after half-time and also vomited several times during the match.

Although players running to a standstill and vomiting afterwards is quite common in the AFL, Eagles coach John Worsfold has become concerned at the amount of times it has happened to Kerr.

The 2007 All-Australian has vomited on at least three occasions this season during a match.

"A lot of players throughout the competition have similar issues with keeping fluids in their stomach," Worsfold said.

"It's up to our experts to tell us.

"`Is this just a normal thing? Or is it something we have to address?

"We'll assess potentially if there's an illness there but he's not injured.

"(He was) vomiting badly, which is not unusual, a lot of players do vomit, but then to be cramping up badly a few minutes into the third quarter where he couldn't get rid of the cramp (is a concern).

"I will certainly be asking the question (to our medical staff) is there some reason Daniel was like that?"

Meanwhile, Eagles premiership forward Ashley Hansen in in danger of losing his place in the side for Sunday's clash with Melbourne at Subiaco Oval.

Hansen, who has booted just five goals in six games this season, was kept goalless against the Dockers and collected just 10 possessions.

"It doesn't matter about being a senior player, it's form, and his form isn't as good as it can be, therefore there's pressure on him," Worsfold said.

Former Blue Josh Kennedy, who was kept out of WAFL action on the weekend with an eye injury, could replace Hansen in the side.

"He was certainly in the mix for this week except for his injury," Worsfold said.

Worsfold put his charges on notice after the Eagles lost their fourth straight derby despite leading by 23 points at half-time.

"There's some key things we need to look at," he said.

"Did some of our players lower their intensity because of the different style that Fremantle play?

"If that's the case those players need to be able to answer questions about that.

"They (Fremantle) ran harder and were more attacking in that second half.

"We were flat footed and looked second rate because they were more urgent.

"We've certainly got a lot of kids in good form (in the WAFL) and if we believe they can offer more or they deserve their chance to be in the side then they'll be in."

Brent Staker is in doubt for the clash with Melbourne after injuring his thumb.

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