The Los Angeles Dodgers activated right-handed reliever Blake Treinen from the injured list on Wednesday.

Treinen, 36, last pitched on Aug. 4 and was placed on the 15-day IL the following day with left hip discomfort.

He struck out all three batters he faced during a rehab assignment on Saturday at Double-A Tulsa.

Treinen is 5-3 with a 2.67 ERA in 34 relief appearances this season for the Dodgers. To make room on the active roster, they optioned right-hander Ben Casparius to Triple-A Oklahoma City.

Casparius, 25, did not appear in a game after being called up on Sunday. He has yet to make his major league debut. He is 5-4 with a 3.48 ERA in 18 starts this season at Tulsa and Oklahoma City.

The Dodgers enter Wednesday night’s home game against the Seattle Mariners with a 3 1/2-game lead in the National League West over the San Diego Padres and Arizona Diamondbacks, who both lost their games earlier in the day.