Jackson was listed as a non-participant in Wednesday's practice due to back and knee injuries.
Earlier Wednesday, head coach John Harbaugh attributed Jackson's absence from practice to rest, but after the team's first Week 9 injury report was released, the quarterback was revealed to be nursing a pair of injuries. Regardless, the Ravens haven't indicated that Jackson is dealing with anything serious, and Harbaugh's comments in particular suggest that the team isn't worried about Jackson missing a home game against the Broncos this Sunday.