The San Francisco 49ers head coach Kyle Shanahan says the team will be without cornerback Richard Sherman for at least a week after the veteran suffered a hamstring strain in Friday’s practice, per Herbie Teope of NFL.com.

Sherman felt his hamstring tighten up after falling during Friday's practice and had to leave the field. Sherman’s injury will prevent him from making his 49ers debut in their preseason opener against the Dallas Cowboys Thursday night.

Sherman's next opportunity to play in preseason will be against the Houston Texans on Saturday, Aug. 18.

The 30-year old Sherman joined the 49ers in March on a three-year deal after he was released from the Seattle Seahawks. In seven seasons with Seattle, Sherman was a three-time All-Pro selection and a four-time Pro Bowler.

Although it’s just a minor hamstring strain, the Niners will likely take extra precaution with Sherman, who is just coming back from a torn Achilles which cost him most of last season.

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San Francisco 49ers wide receiver Brandon Aiyuk next to 49ers general manager John Lynch and 49ers head coach Kyle Shanahan. Aiyuk has a speech bubble that says “Fire pick, can’t lie.”

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GM John Lynch in the middle, Jordan Morgan, TJ Tampa, Jalyx Hunt around him, and San Francisco 49ers wallpaper in the background

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While Sherman is back in training, he's still far from his All-Pro-caliber best, as evidenced by a particular play in practice.

With Sherman out, the 49ers’ younger corners — rookies Tarvarus McFadden, Emmanuel Moseley, and DJ Reed, as well as second-year corners Adrian Colbert and Greg Mabin — figure to get a bit more playing time against the Cowboys.