Head coach Kyle Shanahan said Jennings (concussion) won't practice Wednesday, Cam Inman of The San Jose Mercury News reports.
Jennings has yet to take part in drills since sustaining a concussion during the 49ers' Week 15 win at Arizona. After Jennings was ruled out ahead of Monday's 33-19 loss to the Ravens, Shanahan told Nick Wagoner of ESPN.com that the wide receiver "has made steps" through the five-step concussion protocol. Having said that, it hasn't translated to Jennings being able to get in work on the practice field.