Jackson wasn't at the media-access portion of Wednesday's practice, and he may be dealing with a groin or core-muscle injury, according to Jonas Shaffer of TheBaltimoreBanner.com.
Shaffer notes that Jackson seemed to have some discomfort in his groin or abdomen following Sunday's 29-24 loss at Cleveland. The Ravens will release their first Week 9 injury report later Wednesday, when it will become known whether Jackson missed practice entirely or ended up being a limited participant.