The Dons look set to be without talismanic stand off Paul Cooke for a stretch of their key relegation run-in.
Cooke suffered an ankle injury in the Northern Rail Cup defeat to Sheffield Eagles last Friday.
And he is almost certain to miss a Dons game for the first time this season tomorrow when Leigh Centurions visit the Keepmoat (3pm).
Head coach Tony Miller said: “Cookie rolled his ankle against Sheffield and he’s struggling.
“We’re hoping it turns out it’s not too serious but he’ll probably miss Leigh.
“We’ll just have to see where we go from there.”
Since his arrival last January, former Super League ace Cooke has been instrumental in so much of the Dons’ play.
While he sweats on the fitness of Cooke, Miller could be handed a boost by the return of hooker Kyle Kesik.
Kesik is back in training following injury but Miller is unlikely to risk the 24-year-old if he is not close to 100 per cent. Dennis Tuffour could also make his return tomorrow.
Miller is taking both the negative and the positive from his side’s cup exit.
He said: “I’m not happy to be out of the cup - we’ve just lost in a semi-final after all.
“It was a nice distraction while it lasted - we don’t often get an opportunity to play for a final, and we wanted to win it. It’s more important for us to stop in this league, but if we’d got to the final it could have been a nice boost.
“Getting this far did give us a boost, but it caused problems for us too.
“We have matches to fit in midweek now, and we picked up a couple of injuries too.
“Now we have 10 games left, seven at home, and we have to pick up some wins to make sure we stay in the division.”