Overview

• The 49ers ruled out starting quarterback Brock Purdy for Week 5 and consider him week to week following an MRI that showed an aggravation of his turf toe.
• San Francisco signed Adrian Martinez to the 53-man roster to back up Mac Jones, a move some analysts view as a sign Purdy may miss more than one game; Martinez has yet to play in a regular-season NFL game.
• Mac Jones started against the Rams and briefly appeared to injure his left knee in the third quarter before returning to the field, according to the Associated Press.
• Top receivers Ricky Pearsall and Jauan Jennings were inactive, leaving Jones to work with a thin group of pass catchers and lean on Christian McCaffrey.
• During the game, the 49ers led 17-7 at halftime with Jones throwing two touchdowns as reported by NBC Sports.