SANTA CLARA, Calif. — The San Francisco 49ers placed All-Pro running back Christian McCaffrey on injured reserve because of his lingering calf and Achilles tendon injuries.

The move made Saturday means McCaffrey will miss at least four more games after already sitting out the season opener. He is eligible to return for a Thursday night game in Seattle on Oct. 10.

McCaffrey got hurt early in training camp and missed four weeks of practice before returning to the field on a limited basis…