"K'Waun's kind of in the same boat as a few other guys like Jordan (Reed) and (Arik) Armstead. We're taking care of him," Shanahan said. "He could go if he wanted to or if we really needed him to. I think it was a little calf tightness. That's what I think it was, but nothing too big."
Tom Pelissero of NFL Network reports an MRI revealed that Williams suffered a Grade 1 calf strain.
The injury can typically take two to four weeks to completely heal, which could make him available for the 49ers' Week 1 contest against the Arizona Cardinals on September 13. The estimate for Williams, however, appears to be in the two- to three-week range.
As Pelissero stated, San Francisco will likely be cautious with his recovery, but it's good news that the injury wasn't more serious.
Williams was an essential part of the 49ers' top-ranked pass defense last season. He was among San Francisco's first signings after Shanahan and general manager John Lynch took over in 2017. The veteran is entering his sixth NFL season. He did not play during the 2016 season.
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