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McKinnon Suffers Torn ACL; RB's Season Is Over
The 49ers big free agent pickup and starting RB Jerick McKinnon suffered a torn ACL today, according to multiple reports.

McKinnon's season is over.

McKinnon returned to 11-on-11 drills Saturday for the first time since sustaining a calf injury three weeks ago. On the final play of practice, he went down with the injury. “He just made a cut on air and no one was around him and just went down,” Shanahan said. “It looked awkward.”

The 49ers open the regular season on Sunday, Sept. 9, against the Minnesota Vikings, McKinnon’s former team. The 49ers signed McKinnon to a four-year, $30 million contract on the first day of free agency. He was expected to be one of the central figures of the team’s offense, as a runner and receiver.

The 49ers kept three other running backs, along with fullback Kyle Juszczyk on their roster. According to NBCSports.com's Matt Maioccos, veteran Alfred Morris, who was signed two weeks ago, could be the starter when the 49ers open the season. Matt Breida is likely to be the backup, with special-teams ace Raheem Mostert available in emergency situations.