Town travel to South Yorkshire to take on the Eagles on Sunday.
Workington were defeated by Swinton last weekend.
Coach Phil Vievers said: “I thought we underperformed. We had a simple game plan that we didn’t stick to, my half-backs didn’t deliver the game plan for us and it was a loss.
“We need to regroup now and face the rest of the season.
“It’s a tall task with the amount of injuries we’ve got to get a result against Sheffield this weekend. It’ll be tough.”
Sheffield secured an impressive 54-24 win over Oldham last weekend.
Coach Mark Aston said: “Oldham have done the double over us this season, so we needed to make a statement.
“We didn’t start well but from 60 minutes we were good. Once we got into gear we started doing the things we are capable of; we took the game away from them.”