Free agent Camara, who had a recent trial at Bramall Lane, has been signed on a short-term contract until the end of the season and could be involved as Blackwell contends with a crippling injury list.
Jamie Ward (broken wrist), Lee Williamson (back), Derek Geary, Gary Naysmith, James Harper, Nick Montgomery (all knee), Paddy Kenny (drugs ban) and Andrew Davies (knee) all remain sidelined.
Richard Cresswell was forced to play with a rib injury in the midweek defeat at Blackpool and is a major doubt, while fellow striker Darius Henderson is struggling with an ankle problem.
The Blades have won only one of their last seven league matches and have slipped to 13th place in the table.
