SANTA CLARA – The 49ers lost three defensive starters due to injuries in the third quarter of Sunday’s game against the Tampa Bay Buccaneers at Levi's Stadium.
Defensive lineman Arik Armstead (shoulder), rookie cornerback Rashard Robinson (knee) and outside linebacker Aaron Lynch (ankle) were forced out of the game due to injuries.
Armstead’s condition appeared to be an aggravation of a left shoulder injury he has been managing since training camp. Armstead did not play in any of the 49ers’ four exhibition games due to the injury. He said the undisclosed condition might force him to have surgery at the end of the season.
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Robinson made his fourth consecutive start. He and Lynch left the game on back-to-back plays. Robinson sustained a left knee injury, while Lynch exited with a left ankle injury.
The 49ers will return to action on Nov. 6 against the New Orleans Saints after the bye week.