Athletics slugger Brent Rooker will miss the rest of the 2026 season after left knee cartilage surgery

The Oakland Athletics will be without designated hitter Brent Rooker for the remainder of the 2026 season after the club confirmed he will undergo left knee surgery to repair a cartilage tear. The move was announced by Athletics manager Mark Kotsay ahead of a game against the Los Angeles Dodgers, and it ends Rooker’s season earlier than anyone expected given his role as the team’s primary power bat.

Kotsay characterized the news as a major loss for the A’s offense, calling Rooker a middle-of-the-order hitter who produced for the club over the past three seasons with 30-plus home runs. In his absence, the team will be forced to redistribute at-bats and power opportunities, essentially re-centering its lineup around other hitters and the timing of which additional bat can provide consistent run production.

According to, the knee issue followed a period of rehab and reevaluation. Rooker paused work during a left-knee rehab from an earlier problem and then was set on a path toward surgery after doctors determined the cartilage tear needed to be addressed. The same report framed this as the latest injury development in a difficult stretch, one that has increasingly affected Oakland’s day-to-day roster availability.

The knee surgery arrives during a broader health drain. reported that in the span of about a week the Athletics also lost Zack Gelof, Jacob Wilson, and Tyler Soderstrom to the injured list, and that the club had reached a season-high nine players on the IL. With injuries mounting, Oakland has already used multiple injured-list placements this year, tightening the margin for error as it tries to stay within range of postseason positioning.

Rooker’s 2026 production before the shutoff was a factor in how consequential the loss is. CBS News reported that through 48 games he hit 10 home runs and drove in 29, while also described a right oblique strain earlier in the year that cost him 15 games. After returning on April 25, Rooker hit.216 with a.709 OPS and eight home runs in 36 games leading into the more recent left-knee problem, which culminated in the decision for season-ending surgery.

The immediate competitive stakes for Oakland are heightened by where the A’s sit in the American League West and the wild card picture. CBS News reported the A’s are 3.5 games behind the AL West-leading Texas Rangers and 3.5 games out of the final wild-card spot at the time of the update. In that context, losing a core power source like Rooker is not only a lineup problem, it also impacts how much production the team can realistically expect from the rest of its roster.

Looking ahead, the A’s next steps will likely focus on who fills the void in the middle of the order and how long Oakland can stabilize offensive output while managing the injured list. The Dodgers series matters only as a short-term test, but the bigger question is whether Oakland can convert remaining opportunities into enough runs to stay in the playoff hunt as the season progresses without its top designated hitter.

For Rooker, the focus turns to recovery and rehab following cartilage repair. The surgery date and longer-term plan were not detailed in the early reports, but indicated the procedure is expected to keep him out for the remainder of the 2026 season. The Athletics will have to treat this as a long-term roster design challenge rather than a quick detour. (All reported updates are current as of July 2, 2026.)