The Dodgers lost a bullpen arm before he ever threw a pitch Saturday. Blake Treinen, who had only returned from a lengthy elbow injury earlier this month, hurt his right shoulder while warming up during the seventh inning of Los Angeles' 4-3 win over the Giants at Oracle Park. Dave Roberts said afterward that the veteran reliever's season is finished.

“It's unfortunate. He was warming up, and it was the shoulder,” Roberts said after the game. “I don't know if it was a complete blowout, but really unfortunate. We're going to get imaging. But yeah, it's obviously an IL. His season's over.”

Treinen felt it on a single pitch and made a visibly pained expression, according to Roberts, before leaving the bullpen with a trainer. Brock Stewart entered the game in his place. Roberts indicated the shoulder issue was related to what had sidelined him earlier this year.

The timing could hardly be worse for a 38-year-old who spent most of the season fighting to get back. Treinen missed roughly 10 weeks and 62 games with right elbow inflammation before being reinstated on Sept. 2. He made seven appearances after returning, though none in high-leverage spots, and his place on the postseason roster was already uncertain.

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His injury history with this shoulder runs deep. Treinen developed shoulder trouble in 2022 that eventually required surgery to repair his labrum and rotator cuff, costing him the entire 2023 season. Whether this injury connects to that damage is not yet known.

The numbers from his 2026 campaign are modest. Treinen went 4-1 with a 3.64 ERA and 31 strikeouts across 36 appearances and 29 2/3 innings. Across six seasons in Los Angeles, he owns a 2.88 ERA with 12 saves and 236 strikeouts in 206 innings. The two-year, $22 million deal he signed before 2025 ends having produced roughly 56 innings.

Los Angeles has the depth to absorb it. The Dodgers will call up a fresh arm for Sunday's regular-season finale, a scheduled bullpen game, before a five-day break ahead of the first round. Tanner Scott, Alex Vesia, Edgardo Henriquez and Jack Dreyer anchor the relief corps, with Roki Sasaki and Justin Wrobleski expected to work out of the bullpen in October.