The San Francisco 49ers' fears about the injury to rookie defensive end Mykel Williams were confirmed Monday afternoon when a source told ESPN's Jeremy Fowler that Williams tore the anterior cruciate ligament in his right knee.

The 49ers improved to 6-3 with a Week 9 win over the Giants. See how San Francisco's NFC playoff picture and seeding shape up heading into Week 10.

Late in the fourth quarter, first-round pick defensive end Mykel Williams went down with a right knee injury. Afterwards, coach Kyle Shanahan told reporters that they fear Williams injured his ACL. A torn ACL would sideline Williams for the remainder of the season.

NFL.com says teams are calling on Jauan Jennings, but with Aiyuk still ramping up and Shanahan signaling stability, a 49ers trade is unlikely.

San Francisco 49ers running back Brian Robinson Jr. found the end zone for the first time this year on Sunday, and his teammates

The San Francisco 49ers continue to find ways to win games, but at the end of every game, they seem to add another new name to the injury report. While some have been more serious than others, it appears as though edge rusher Mykel Williams' ACL injury could be a season-ending injury .

The 49ers improved to 6–3, beating the Giants 34–24 in Week 9 behind Christian McCaffrey’s record-breaking performance.

Mykel Williams is feared to have suffered a potential season-ending injury in San Francisco's win over the Giants.