German striker Proschwitz signed on loan from Hull until the end of the season last week, while midfielder Lawrence made his first appearance off the bench in the home win against Blackpool last time out.
Another recent loan signing, Liverpool full-back Ryan McLaughlin (hamstring), and winger Jim O'Brien (groin) are both doubtful, while defender Bobby Hassell (calf) and striker Marcus Pedersen (thigh) remain sidelined.
Barnsley are bidding for back-to-back wins for the first time this season.
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- Bobby Hassell