Fremantle skipper Matthew Pavlich and small forward Michael Walters will decide themselves whether they are right to play this weekend.
Both players suffered heavy blows to the head against Melbourne at the weekend and sat out the second half of the match.
Fremantle coach Ross Lyon said that both Pavlich and Walters have passed concussion tests this week, but he was unable to guarantee their starting positions in the side.
"They've cleared all their tests but it's going to be up to the individual, how they feel, if they're symptom-free. This is our first real training session so we won't know.
"They'll train. Matthew will partially train I would think. Michael is further advanced. I'm optimistic on both, but no guarantee on either."
Lyon also said that he will have no influence on the selection of the star duo.
"I don't get involved," Lyon said.
"Our doctors make all the calls on all injuries. As long as they're symptom-free they're available to play.
"But then it really comes up to the individual as well.
"If there was any concern whatsoever it wouldn't even be a discussion, but clearly there are no concerns as we speak now.”
Fremantle face Essendon at Domain Stadium on Saturday night.
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