Midfielder Sparrow completes a three-game ban and defender and skipper Greer is one game into his three-match suspension.
But manager Gus Poyet has no new injury concerns ahead of the weekend.
Midfielder Alan Navarro has had an operation on his ruptured cruciate ligament and now embarks on his lengthy rehabilitation.
Goalkeeper Peter Brezovan is still missing with a wrist injury but he has been pencilled in for a return in the Johnstone's Paint Trophy against Leyton Orient next week.
Young defender Lewis Dunk is the only other injury absentee as he recovers from a fractured bone in his foot.