Jackson (knee) isn't practicing Wednesday, Jamison Hensley of ESPN.com reports.
While the Ravens haven't officially ruled Jackson out for Week 14, his recent diagnosis of a PCL sprain in his left knee makes Tyler Huntley the expected starter this Sunday in Pittsburgh, and perhaps for a game or two beyond that. Any practice participation from Jackson this week would be a surprise, after head coach John Harbaugh deemed the quarterback "week-to-week" Monday.