Lincoln City manager Steve Tilson says he may have to bring in loan players after injuries left the Imps with only three fit defenders.
Tony Sinclair suffered a knee injury in Monday's 3-1 defeat by Darlington and a back problem sidelined Adam Watts.
Tilson told BBC Lincolnshire: "I may have to look at getting somebody in.
"There is a little bit of money for loan players and if it goes now I may be snookered for the rest of the season but I might have to delve into it."
Tilson felt the Blue Square Bet Premier defeat by the Quakers, Lincoln's third loss of the season, highlighted a lack of aggresssion in the back line.
"As a team we have to be harder to break down when we're not in possession," he said.
"I think it's too easy at the moment for teams to get a header, a shot, a run through us.
"We have to affect it in some way. We cannot keep letting teams do what they're doing."