Report: Brandon Jacobs MRI OK
Jacobs remained on the turf for several minutes while trainers talked with him. He was helped to his feet and hopped off the field on his right leg before being placed on a cart and taken to the locker room.
Jacobs joined the 49ers in the offseason after seven seasons with the New York Giants.
Information from The Associated Press was used in this report.
The NFL on ESPN.com