SANTA CLARA, Calif. -- San Francisco 49ers running back Christian McCaffrey did not practice Friday with a calf issue that popped up during Thursday's workout , but he once again made it clear that he believes he will be on the field Sunday against the Seattle Seahawks .

"I always plan to play," McCaffrey said. "I feel great about where I'm at. Unfortunately, when you have the injury history that I have, sometimes when you don't practice, things get blown out of proportion. But like I said, I feel great."

McCaffrey is officially listed as questionable for the opener in Seattle after he was a surprise addition to the injury report Thursday as a limited participant. During the early portion of Friday's practice open to the media, McCaffrey was in uniform and a helmet doing his usua

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