49ers' cornerback Ambry Thomas suffers broken forearm in preseason opener, out indefinitely.

49ers' cornerback Ambry Thomas suffered a broken forearm in preseason opener and will be out indefinitely, according to coach Kyle Shanahan. Thomas, a 2021 third-round draft pick, played in 15 games last season, with 43 combined tackles and 1 interception. His injury leaves a roster spot open, and Isaac Yiadom may be a potential candidate to fill in during sub-packages. Thomas' consistent performance since being drafted may not be enough to secure a spot on the regular-season depth chart due to his injury and competition with existing cornerbacks.