Purtell was a late exclusion from last week's 30-12 loss to the Bulldogs after failing to recover from a lingering round-four rib injury.
Craig Frawley has been shifted to centre to provide cover for the injured Adam Mogg, who suffered a neck injury last weekend and will be out of the season indefinitely.
Newcomer Marshall Chalk has again been named on the wing to provide cover for the injury ravaged Raiders.
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Not out for the season, he is out indefinitely, which means it could be 10 weeks or it could be 1 week, its a week by week proposition.