San Francisco 49ers running back Christian McCaffrey is questionable for the team’s season opener at the Seattle Seahawks on Sunday due to a lingering calf issue.

After McCaffrey appeared on Thursday’s injury report as a limited practice participant with a calf injury, he sat out practice on Friday.

Asked how concerned he was that the former All-Pro would miss Week 1, coach Mike Shanahan said, “He’s questionable. Questionable concern.”

Later on, McCaffrey told reporters that he feels “great” and plans to play.

“Unfortunately, when you have the injury history that I have, sometimes when you don’t practice things get blown out of proportion,” he said.

A calf issue cropped up for the three-time Pro Bowler last fall, as well, which was eventually diagnosed as an Achilles sprain. That inju

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