Sharp arrived at the Keepmoat Stadium last week and could fill the void left by Paul Heffernan, who is struggling with a groin problem.
Manager Sean O'Driscoll has no other new injury or suspension problems and is unlikely to make any other changes from the side that outplayed Cardiff in a 2-0 home win last time out.
Brian Stock has returned from international duty for Wales unscathed. The Doncaster skipper turned in an impressive display in his first full international for Wales in their World Cup qualifying defeat to Russia.
Long-term absentees Steve Brooker (ankle) and Sean McDaid (knee) remain sidelined.