Penrith fullback Lachlan Coote has completed his first full training session with the NRL side as it prepares for Saturday's semi-final against the Sydney Roosters.

Coote, who has missed six games with osteitis pubis, took part in contact and ballwork session at CUA Stadium but coach Matt Elliott said he was no certainty to play at the Sydney Football Stadium.

"The answer for Cootey is it's not what he did today, it's how he pulls up tomorrow," Elliott told reporters on Wednesday.

"That's the first real solid hitout where he's done lateral movement and some contact."

Elliott said Coote would need to complete the side's final session this week to be considered for a recall.

The Panthers have lost second-rowers Trent Waterhouse (pectoral) and Frank Pritchard (hamstring) for the do-or-die clash.

Interchange prop Tim Grant remains in doubt with an ankle injury and did not train after pulling up sore from Tuesday's session.

"It's an assessment that has to be made over the next two days," Elliott said of Grant.

"The medical staff are confident."

Waterhouse may be unable to contribute on the field, but has been conducting part of the Panthers' video sessions this week.

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