Like San Francisco 49ers cornerback Richard Sherman and guard Joshua Garnett, slot-man K'Waun Williams won't play in Thursday's exhibition opener against the Dallas Cowboys. He will be sidelined for at least a week, the team announced on Monday.

Williams left practice early on Sunday after suffering what appeared to be an ankle injury. He received treatment from the team's training staff after falling to the ground.

"I heard he just rolled his ankle," head coach Kyle Shanahan said after practice. "Maybe we'll find out more later. Right now, we don't think it's [a high-ankle sprain], but we'll see."

The 49ers signed Williams in February of 2017, which made him the first player signed by Shanahan and general manager John Lynch. The cornerback appeared in 14 games with five starts while recording 54 combined tackles, five passes defensed, an interception, and a sack last season.

The 49ers rewarded Williams with a three-year extension last September, keeping him under contract through the 2020 season.

Below are some other injury notes announced by the 49ers as the team kicked off practice on Monday.

  • DE Arik Armstead (hamstring) is week-to-week
  • G JP Flynn (knee) out this week
  • G Joshua Garnett (knee) out this week
  • CB Richard Sherman (hamstring) out this week
  • CB K'Waun Williams (ankle) out this week
  • LB Mark Nzeocha (elbow) is day-to-day
  • TE Cole Wick (knee) is day-to-day
  • LB Bock Coyle (hip) limited
  • LB Fred Warner (chest) limited
  • C Weston Richburg has Monday off as a rest day