The 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 last week. He was a late scratch for the opener on Monday night against the Jets and now is sidelined again after experiencing pain following practice on Thursday.

McCaffrey led the NFL last season with 2,023 yards from scrimmage and was tied for the league lead with 21 touchdowns, winning AP Offensive Player of the Year.

The Falcons hosted the football team from Apalachee High School a week after a shooting left two students and two teachers dead. The high school players watched practice Friday from the sideline at the Falcons’ training complex in Flowery Branch. Among the victims of the Sept. 4 shooting was a teacher who served as an assistant football coach for the Apalachee football team.

College football: The NCAA has given full approval for Gallaudet’s football team to use a helmet designed for players who are deaf or hard of hearing this season. The helmet developed by Gallaudet University and AT&T debuted last year with the team getting the chance to play one game with it.

Golf: Rory McIlroy delivered enough superb shots in a strong wind Saturday for a 2-under 69, giving him a one-shot lead over Matteo Manassero in the Irish Open as McIlroy tries to erase two bad memories on home soil.

NBA: Restricted free agent forward Isaac Okoro agreed to re-sign with the Cavaliers on a three-year contract.