Rookie Chelsea defender Ben Gordon has joined Rovers a one-month loan deal and Leeds winger Andy Robinson has signed on loan until the end of the season.
West Brom midfielder Joss Labadie has also signed on loan until the end of the season.
Gordon seems certain to be handed a starting role as left-backs Zoumana Bakayogo and Aaron Cresswell are both suspended.
Parry said: “Ben is a talented defender with a lot of potential and his signing means we don’t have to play someone out of position.”
On-loan Manchester City defender Shaleum Logan is missing with a hernia and skipper Ian Thomas-Moore is doubtful with a knee problem.