The 29-year-old, named at halfback for Western originally, suffered the injury as his side had a run against the Kurt Hancock-trained Rams under 18s side last week in the lead-up to Sunday's matches against Monaro.

Siejka came into contact with one of the under 18s players and suffered an identical injury to one he experienced during his time playing in England, only this time on the other foot.

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The former NRL player and current Mudgee Dragons half isn't certain how much time he'll spend on the sidelines but confirmed his absence for the rest of the Rams' run.

Orange Hawks recruit Toby Westcott started in the number seven jersey during the 18-14 loss on Sunday.

"They only called him up on Thursday and that's a really hard ask for a young kid," Siejka said of Westcott.

"Once we started to click in that second half he looked a lot better. Cam's a good coach so I'm sure he'll have him going."

Getting into the specifics of the injury, Siejka not only suffered a bone break, but a high ankle sprain to-boot.

"Worst case scenario for me is 12-15 weeks," he said.

"Obviously I don't want to miss time but I'm not going to rush back if I'm not healthy... I've done that before."

Luckily for Siejka, he won't miss too much time at club level and says six games is the longest frame he can see himself sitting out for Mudgee.

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