County are likely to be without Alan Judge for the midweek cup-tie.
The midfielder was forced off with a dead leg during the 4-0 thrashing of Carlisle at the weekend and is unlikely to be risked.
Magpies manager Keith Curle is definitely without midfielder Joss Labadie (knee ligaments) and defensive duo Manny Smith (knee) and Tom Williams (calf).
Curle is unlikely to make too many changes to his side and expects both clubs to name strong line-ups.
"I said from day one that we will be competitive in every fixture we play in, whether that's Capital One Cup, Johnstone's Paint Trophy or FA Cup," he told Magpie Player.
"Both managers will treat it exactly the same, it's a competitive fixture with an opportunity of progressing. I don't think either team will play a weakened team."
Chris Porter, Shaun Miller and Richard Cresswell are among those in contention for a starting berth at County.
Blades boss Danny Wilson, who has no new injury or suspension worries, has hinted at several changes, with defender Darryl Westlake, striker Jordan Chappell and midfielder David McAllister also hoping to feature.
Teenager George Long will continue in goal in the absence of Mark Howard (thigh), but central defender Neill Collins is not expected to return after missing the weekend draw with Oldham due to an infected toe.
Wilson is expected to rest strikers Nick Blackman and Dave Kitson, while another forward, John Cofie, could also be given a break after recently shaking off a groin injury.
The Yorkshire outfit are unbeaten in 13 games in all competitions this season.