Cosgrove returns to the minors to clear a spot on Chicago’s active roster for top prospect Cade Horton. The 28-year-old lefty has made two relief appearances this season at the big-league level. He should return in a couple weeks.

With Caleb Thielbar away on paternity leave, Cosgrove will provide the Cubs with a fresh arm in their bullpen for their weekend set against the Mets. Cosgrove has made one appearance with the Cubs this season, firing a pair of scoreless innings with two strikeouts.

Cosgrove heads back to the minors after sipping a quick cup of coffee with the Cubs. The 28-year-old lefty tossed a pair of scoreless frames in his lone appearance with the club after being called up last weekend.

Cosgrove was a mainstay in San Diego’s bullpen from 2023-2024 when he made 72 relief appearances, finishing with a solid 3.95 ERA, 1.20 WHIP and 59/25 K/BB ratio across 66 innings during that span. The 28-year-old southpaw joins Chicago’s relief corps ahead of Sunday night’s showdown against the Phillies at Wrigley Field.