Oakland Athletics designated hitter Brent Rooker is set to miss the remainder of the season after suffering a left knee injury, according to multiple reports. Yahoo Sports, the Winnipeg Free Press, and Fox Sports all state that Rooker will undergo season-ending surgery. Fox Sports specifies the procedure is intended to repair a cartilage tear in his left knee. The reports agree that Rooker is one of Oakland’s primary offensive threats and that the injury removes him from active play for the rest of the year. While the outlets differ slightly in phrasing and the level of detail provided, they consistently describe the injury as involving his left knee and characterize the surgery as ending his current season. All sources indicate the timing is upcoming and that Rooker’s recovery and return are not expected until beyond the current season. No other teammates or organizational moves are reported in the provided excerpts.