INJURY UPDATES
RHP Luis Castillo (Grade 2 left hamstring strain)
Expected return: 2025
The innings-eating workhorse sustained the injury on Sept. 8 while attempting to duck out of the way of a throw on a stolen-base attempt. The pain intensified over the ensuing two pitches, which forced him to exit.
An MRI the following day revealed the severity of the injury. Castillo attempted to gear back up for the final week, but once the Mariners tumbled out of playoff contention, they opted not to activate him before season’s end. (Last updated: Sept. 29)
60-DAY INJURED LIST
RHP Matt Brash (right elbow inflammation)
Expected return: June 2025
Brash, who underwent Tommy John surgery on May 8, rejoined the Mariners in Seattle during the second week of September, to begin ramping up his throwing program more. It will be his second visit with the club, after joining his teammates in early August to work with the club’s high-performance staff and connect with pitching coach Pete Woodworth and director of pitching strategy Trent Blank. Brash’s surgery ended his 2024 season, three months after initially experiencing soreness during his second bullpen session in Spring Training. Brash had the ulnar collateral ligament in his pitching elbow repaired and a brace installed, which has typically allowed patients to begin physical therapy sooner. That’s why the Mariners are hopeful Brash can return in 12 months, potentially as soon as June 2025. (Last updated: Sept. 29)
OF/UTL Sam Haggerty (torn right Achilles)
Expected return: May 2025
Haggerty tore his right Achilles on May 18, in his second game after getting optioned back to Triple-A Tacoma, and he underwent surgery with Dr. Albert O. Gee at the University of Washington the following week. He then departed for Arizona shortly after to transition his recovery there. Before leaving Seattle, Haggerty mentioned in passing that his timeline would be around 12 months if all goes well with his subsequent rehab. (Last updated: Sept. 29)
RHP Jackson Kowar (right UCL surgery)
Expected return: 2025
Kowar was transferred to the 60-day IL shortly after receiving word that he would need to undergo Tommy John surgery, which ended his season before it even began. The former first-round Draft pick was among the leading candidates to win a bullpen spot before suffering the injury in his second Cactus League outing. (Last updated: Sept. 29)
MINOR LEAGUE INJURIES
RHP Teddy McGraw (arm flexor); No. 14 on Mariners’ Top Prospects list
The 2023 third-round Draft pick met with Dr. Keith Meister in early September after experiencing tightness in his pitching arm during an Aug. 22 outing for Single-A Modesto. Mariners general manager Justin Hollander said at the time that Meister and McGraw were still evaluating options. “We are concerned” about McGraw’s status, the GM said. The 22-year-old McGraw has undergone Tommy John surgery twice, which itself creates more elevated concern. (Last updated: Sept. 29)
SS Felnin Celesten (season-ending left hamate surgery); No. 5 on Mariners’ Top Prospects list, No. 68 overall
Celesten underwent the surgery shortly after the All-Star break after experiencing multiple setbacks with a left wrist injury. After further inspection, doctors discovered that the prolonged pain was related to an old injury to his hamate. But Mariners general manager Justin Hollander said in early September that Celesten could begin baseball activities soon. The development ended Celesten’s season due to an injury for the second straight year, after he was sidelined at the end of 2023 with a Grade 2 hamstring strain. He wound up playing in 32 games in ’24, all at the Arizona Complex League, where he slashed .352/.431/.568 (.999 OPS) with three homers, four triples, 10 doubles, five stolen bases, 27 RBIs, 18 walks and 28 strikeouts in 144 plate appearances. (Last updated: Sept. 29)
