Murchie also confirmed that Scotland duo Zander Fagerson (calf) and Jack Dempsey (hamstring) are unavailable for the clash.
However, Dempsey and Fagerson could play a part next week if the Warriors advance to the semifinals.
Venter is in the mix again having served a six-match ban for foul play, and Murchie says the South Africa is ready to go.
"You haven't seen him on the pitch but he's been out doing every single session," he said. "So, he's been fully involved.
"From his perspective, physically, he's as good as you get.
"He's been doing the training without getting banged up at the weekend. It's good to add in that amount of freshness if he's selected."
Johnny Matthews could also return from injury but, if he doesn't make it, teenager Seb Stephen could be in line for a call following his impressive debut away to Leinster.