Full-back McAllister (broken rib) has been out for six weeks while midfielder Skuse and striker Stead have each been on the sidelines for 10 weeks with respective toe and ankle problems.
The trio came through a behind-closed-doors game unscathed on Wednesday and could be added to manager Keith Millen`s depleted squad.
During the international break, Millen received the news that on-loan centre-half Steven Caulker (knee) will join fellow defender Liam Fontaine (ankle) in missing the rest of the season, while captain Louis Carey is still recovering from a skull fracture.
Christian Ribeiro is also on the sidelines and Millen received further bad news this week when midfielder Kalifa Cisse pulled out of training with a thigh problem.
With so many defenders out injured, Millen has few options available. One solution would be to move Lewin Nyatanga from left-back to partner Damion Stewart in the centre of the back four. Alternatively, he could turn to Jordan Spence, who has extended his loan from West Ham until the end of the season, as a centre-back and call up Joe Edwards to cover at right-back.
Source: PA
Source: PA