Hull KR's acting captain Michael Dobson will be out of action for around a month with a shoulder injury.

Despite the four-week absence, coach Craig Sandercock has revealed that the problem is not as bad as first feared.

"His injury requires nothing more than conservative management and it looks likely that he'll only miss the next month of football, which is positive news for us," said Sandercock.

"Being without Michael makes life tough for us, especially with the other injuries that we have.

"But I've always said that these kind of problems present opportunities for others and we'll just get on with the job."

Dobson joined Hull in 2008 from Canberra Raiders.