San Francisco 49ers defensive tackle Kalia Davis will undergo knee surgery and is expected to miss half of the 2024 season after sustaining an injury in the preseason opener against the Tennessee Titans. This injury adds to a history of health issues for Davis, who missed his rookie season and part of last year due to knee and ankle problems. Head coach Kyle Shanahan expressed disappointment, noting Davis's strong performance before the injury. The 49ers canceled a joint practice with the New Orleans Saints due to a high number of injured players, including key figures like Christian McCaffrey and Elijah Mitchell. Cornerback Ambry Thomas also sustained a significant injury and will be out for a similar duration. The 49ers are aiming to have both Davis and Thomas back by midseason, leveraging new roster rules for injury returns.