Diggs won't practice Thursday due to an illness, Alaina Getzenberg of ESPN.com reports.
Bills head coach Sean McDermott told Getzenberg that he hopes to have the wideout back on the field later this week, but Diggs' status is now worth monitoring as Monday's game against the Bengals approaches. In his last outing in the Bills' Week 16 win over the Bears, Diggs caught both of his targets for a season-low 26 yards.