The 41-year-old came on as a second-half replacement in Monday's 2-2 draw at Barnsley for Gary Woods, who sustained a leg injury.
Sullivan has been struggling in recent months with what was initially thought to be a calf problem but what has now been diagnosed as "a pre-cursor to a stress fracture''.
Woods will take his place on the substitutes' bench but midfielder and skipper Brian Stock and defender Mustapha Dumbuya are expected to play some part after returning to training this week.
Stock missed the Oakwell clash due to an ankle injury and Dumbuya sat it out because of a thigh problem.
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Doncaster Rovers - Leicester City Live Streaming
14:00 +00:00, April 30, 2011
Keepmoat Stadium, England
Watch Doncaster Rovers vs Leicester City live
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