Leigh coach Ian Milward expects Stanton to still make Sunday’s squad but is less hopeful on the fitness of Duffy and Ridyard.
Millward said: “Sheffield put on a terrific performance themselves last Saturday when scoring more points against a strong Wigan side than any other team this season, and that shows just how stiff a test we are facing.”
Aaron Groom is nearing a return for the Eagles, although Sunday’s trip to Leigh is likely to come too soon for the former Canterbury half back.
Aston said: “The lads were up against the best in Super League but they never gave up and finished strong – scoring tries.
“We’ve got a few bangs and bumps but we’re ready for Leigh. It’s going to be a tough one but we just have to believe in our ability.”