Sheffield United Danny Wilson is unlikely to be able to call on hamstring victims Matt Hill and Tony McMahon this weekend.
The defensive duo both limped out of last Saturday's 1-0 defeat at MK Dons and United went on to lose their first League One game of the season.
Although the prognosis is not too severe, they are unlikely to be fit for the visit of Stevenage on Saturday.
"They are struggling. We have got another 48 hours or so, but they are struggling and I'm not banking on them being fit for the game," Wilson said. "It's too early to say how long they will be out, it might be sooner rather than later, but they are struggling for Saturday.
"I don't think it is any coincidence that they have been in the team and we have had as many clean sheets as we have. So the dynamics of the team will change, but whoever comes in, it is an opportunity.
"In an ideal world we want our experienced players out there, but we aren't in that position."