Jennings (heel) was limited to side work during Thursday's practice, Nick Wagoner of ESPN.com reports.
jennings appears to be progressing towards being available for the 49ers' final preseason game against the Raiders on Sunday. The 2020 seventh-round pick was forced to miss last week's contest after an impressive performance during Week 1 of the preseason. He spent parts of his rookie season on the practice squad and was vying for a spot on the regular-season roster before his injury.