Dodgers reliever Brock Stewart will undergo season-ending shoulder surgery, manager Dave Roberts tells the L.A. beat (including Fabian Ardaya of The Athletic). The right-hander has been on the injured list since the middle of August and evidently suffered a setback.

It’s another hit to a bullpen that is the Dodgers’ biggest weakness heading into the playoffs. Blake Treinen has given up 11 runs in 7 1/3 innings this month. Closer Tanner Scott has surrendered six runs over his past 7 1/3 frames. Treinen has a 5.47 earned run average on the season; Scott has allowed 4.82 earned runs per nine. Kirby Yates has been knocked around as well, and he went down with a hamstring strain earlier in the week.

Michael Kopech has been limited to 11 innings by a trio of injuries. He’s back on the IL with knee inflammation and will at least be unavailable for the Wild Card Series. Brusdar Graterol never made it back from last year’s shoulder surgery. Evan Phillips underwent Tommy John surgery in June. Stewart is their seventh potential high-leverage arm who is either unavailable or not performing to expectations.

More to come.