Mullens will head into Sunday's game against the Dolphins as the 49ers' No. 3 quarterback after head coach Kyle Shanahan named C.J. Beathard as the top backup to starter Jimmy Garoppolo, David Lombardi of The Athletic reports.
Mullens' two-interception performance against the Eagles in Week 4 has led to his descent on the depth chart, and he may not even end up active versus the Dolphins. The 25-year-old has impressed on the field in the past, particularly back in 2018 when he started eight contests. Mullens could still end up reclaiming the No. 2 role from Beathard at some point later this season.