49ers are signing former Texans’ RB Marlon Mack to their practice squad, per source.

Related players: Jeff Wilson, Tyrion Davis-Price, Kyle Juszczyk, Jordan Mason

Wilson is expected to be the starter but Mack gives a little more security on the depth chart should he be needed as Davis-Price is a rookie.

Due to the sprained MCL that Elijah Mitchell suffered Sunday at Chicago, the sophomore running back is expected to miss about two months.

Related Players: Jeff Wilson, Tyrion Davis-Price, Jordan Mason

The 49ers' yearly injury woes continue right out of the gate, with Mitchell unlikely to return until at least the middle of the season. Behind him in Week 1, Jeff Wilson logged nine rush attempts and ran 17 routes, the fourth most on the team behind Brandon Aiyuk, Deebo Samuel, and Jauan Jennings. It would appear he is most likely to fill in as the team's RB1.