The financially-stricken club, who face a battle to survive off the field this summer, are short on numbers as they look to end their troubled year with a second successive home win.
Blackwell could only name two substitutes for Saturday's draw at Walsall and - of the 13 players he had available then, three could be missing.
Defender Carl Regan and midfielder Tom Soares (both hamstring) are definitely out, while Valery Mezague is struggling with a knee knock.
Blackwell will welcome back Craig Fagan following suspension while fellow striker David Healy (calf) and midfielder Mark Carrington will be assessed after they missed Saturday's draw.
Defender Adam Lockwood has only played 45 minutes of reserve football since November due to groin and back problems but could be named on the bench.