Not spotted Thursday
McCaffrey (thigh) wasn't present at the portion of Thursday's practice open to the media, David Newton of ESPN.com reports.
McCaffrey officially was a non-participant Wednesday due to a thigh concern, which appears as if it'll force a second straight absence to begin Week 4 prep. Coach Matt Rhule told Newton on Wednesday that the Panthers aren't concerned about McCaffrey's health, but his status still should be watched to ensure he'll be available Sunday against the Cardinals.
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Mason rushed eight times for 51 yards in Sunday's 33-17 win over the Dolphins.
Purdy completed 25 of 37 pass attempts for 210 yards, two touchdowns and an interception in relief of Jimmy Garoppolo (foot) in Sunday's 33-17 win over Miami.
The 49ers plan to sign Johnson to their 53-man roster, Adam Schefter of ESPN reports.
Kittle caught two of three targets for 22 yards in Sunday's 33-17 win over Miami.
Aiyuk caught five of nine targets for 46 yards in Sunday's 33-17 win over the Dolphins.
Samuel (quadriceps) had six receptions on 10 targets for 58 yards and rushed four times for five yards in Sunday's 33-17 win over the Dolphins.
McCaffrey (knee) carried the ball 17 times for 66 yards while adding eight receptions on 10 targets for 80 yards and a touchdown in Sunday's 33-17 win over the Dolphins.
Garoppolo sustained a broken foot Sunday against the Dolphins and will miss the remainder of the season, Nick Wagoner of ESPN.com reports.
Garoppolo won't return to Sunday's contest against the Dolphins due to a left foot injury, Nick Wagoner of ESPN.com reports.
Garoppolo was forced out of Sunday's game versus the Dolphins due to an ankle injury.