49ers running back Christian McCaffrey is currently dealing with tendinitis in both Achilles, which has affected his ability to play. Initially reported as a calf injury throughout August, this new information sheds light on his ongoing struggles. McCaffrey is expected to increase his rehab efforts this week, with a potential return to action in Week 10.

• McCaffrey's injury was misreported as a calf issue earlier.
• His return is anticipated for Week 10.