Baldock was nominated for player of the month for March after he scored five goals in five games but turned his ankle after scoring in the 3-2 defeat at Southampton last weekend and came off.
Central defender Gary MacKenzie also scored in that game but is out with an ankle injury of his own.
On-loan QPR forward Angelo Balanta is fit after being sidelined since November with an ankle injury and is pushing for a starting place.
Fellow loanee Keanu Marsh-Brown has returned to fitness following a groin injury but is likely to have to settle for a place on the bench.
Source: PA
Source: PA