Cubs Sign Reliever Aaron Bummer

According to USA Today columnist Bob Nightengale, the Cubs have signed veteran reliever Aaron Bummer to a minor-league contract.

Bummer was released from the Atlanta Braves in his third season there after struggling to a 7.63 ERA in 19 appearances. In 2025, he was much more successful, striking out almost a batter per inning with a 3.52 ERA. 

Bummer returns to Chicago, where he debuted back in 2017. For his career, his ERA is 3.44 with a 1.34 WHIP. His velocity has slipped in his age-32 season down to 90 mph from 93 just two seasons ago.

Fans shouldn’t expect much, but he could play a role in Chicago if he can limit hard contact and walks. He’ll look to recapture his career success in Iowa’s bullpen.