Lynch will miss his third straight game because of a severely sprained left ankle. Kelsay is out after hurting his left ankle in Buffalo's loss to Jacksonville on Sunday.
Lynch practiced Friday on a limited basis and coach Dick Jauron hoped he would be available next week against Miami.
Jackson, the likely starter, spent the 2006 season on Buffalo's practice squad. Wright is a rookie fourth-round pick.
Jackson has rushed for 34 yards on nine carries and eight catches for 55 yards in three games this season. Wright has gained 77 yards on 26 carries.
Jackson had five catches for 47 yards against Jacksonville in the first extensive action of his career.
Coy Wire (neck) and Jerametrius Butler (calf) have also been ruled out.
Copyright 2007 by The Associated Press