McCaffrey (Achilles/calf) appears to be a long shot to play Sunday against the Vikings, sources tell Ian Rapoport of NFL Network.

EDGE Analysis

Citing those familiar with the running back's injury, Rapoport suggests that the 49ers are leaning toward holding McCaffrey out for another week while he manages Achilles tendinitis in addition to a calf strain that dates back to early August. San Francisco head coach Kyle Shanahan intimated Tuesday that the Achilles issue is the greater concern for McCaffrey at this time and is requiring more treatment than the pulled calf. Though McCaffrey could still practice in some fashion this week and perhaps even take a questionable designation into Sunday, Jordan Mason looks to be the early favorite to receive another turn as the 49ers' lead back. Mason turned 29 touches into 152 yards from scrimmage and a touchdown while McCaffrey sat out Monday's 32-19 win over the Jets, with wideout Deebo Samuel (eight carries) essentially serving as the No. 2 back.