McKinnon is dealing with a right calf strain, Nick Wagoner of ESPN.com reports.

McKinnon was removed from Sunday's practice with what was thought to be a knee injury, and he then spent the rest of the day watching from the sidelines. However, a recent MRI apparently showed the running back sustained no structural or nerve damage, so a long-term absence seems unlikely. The 49ers will reportedly give McKinnon a week of rest and then re-evaluate his situation next week.

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