SANTA CLARA, Calif. (AP) — San Francisco 49ers star running back Christian McCaffrey is questionable for the season opener after hurting his calf at practice this week.

Coach Kyle Shanahan said McCaffrey got hurt during practice on Thursday and wasn't able to practice with the team at all on Friday. He was doing some work on the side during the open portion of practice.

McCaffrey's availability for Sunday's game at Seattle will be a game-time decision.

“It's questionable. Questionable concern,” Shanahan said. “I'm not going to say anything about Christian, guys, or any of our players' injuries.”

McCaffrey missed almost all of training camp last season with what the team initially called a calf injury. He was expected to be ready for the start of the season, but was a late scratch for

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