Overview

• The 49ers promoted quarterback Adrian Martinez from the practice squad to the active roster, placing him on the 53-man list until waived.
• With Brock Purdy out, Mac Jones will start against the Rams on Thursday, putting Martinez in line to serve as the backup.
• Edge rusher Trevis Gipson was elevated from the practice squad over William Bradley-King to bolster pass-rush depth.
• Defensive tackle Jordan Jefferson was waived from the practice squad, and cornerback Derrick Canteen was signed to fill the open spot.
• Jefferson’s departure suggests defensive lineman CJ West could be active after a thumb issue, and Kyle Shanahan said the team had considered using a cast.