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According to ESPN's Adam Schefter, San Francisco 49ers running back Jordan Mason is believed to have sustained a sprained AC joint during Thursday night's win over the Seattle Seahawks. Mason is currently undergoing additional tests to assess the extent of the injury.
Head coach Kyle Shanahan is scheduled to speak with reporters via conference call this afternoon, where he is expected to provide further updates on Mason's status.
The NFL's leading rusher, 49ers RB Jordan Mason, is believed to have suffered a sprained AC joint during Thursday night's win at Seattle that is not considered serious, but he will undergo further testing today, per sources. pic.twitter.com/c2tVyxc4sB
Mason left the game in the second quarter and was examined on the sideline before heading to the locker room for X-rays. He briefly returned in the third quarter for a single play but experienced discomfort, preventing him from continuing. Mason finished with 73 rushing yards on nine carries.
With Mason sidelined, rookie Isaac Guerendo stepped up and took most of the remaining running back snaps. Guerendo impressed, finishing with 99 yards on 10 carries.
The 49ers were already short-handed at the running back position. Christian McCaffrey has yet to suit up this season and remains on injured reserve due to calf and Achilles tendinitis issues.
The team will now turn its focus to preparing for a highly anticipated Super Bowl rematch with the Kansas City Chiefs next week at Levi's Stadium.
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