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.
Cardiff boss Dave Jones is expected to have no new injury or suspension concerns for Saturday's trip to Bramall Lane.
Victory for the Bluebirds, combined with results elsewhere, could take them to the top of the Championship table and Jones will be focused on doing better than the club's last visit to South Yorkshire four weeks ago.
Cardiff went down 3-1 to city rivals Sheffield Wednesday at Hillsborough, a defeat that has since seen them embark on a four-match unbeaten run.
Jones may well opt to keep faith with the same side that brushed off the challenge of Coventry in midweek, although his biggest selection dilemma may come in midfield with Stephen McPhail, Joe Ledley and Gavin Rae completing for the two central slots.
Forwards Ross McCormack and Warren Feeney and defender Kevin McNaughton have all returned from injury but are unlikely to muscle their way into the starting XI at Bramall Lane.
On-loan forward Kelvin Etuhu is looking to make his return from ankle ligament damage after November's international break.
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