The Cubs have claimed left-hander Luis Peralta off the Cardinals’ waiver wire, according to Taylor McGregor of the Marquee Sports Network. St. Louis designated Peralta for assignment on Friday. Peralta has been optioned to Triple-A Iowa, and a 40-man roster move wasn’t require since the Cubs only had 39 players on their 40-man.
It’s the second time in less than a week that Peralta has changed teams via the waiver wire. He was designated for assignment by the Rockies on April 21 and was claimed by the Cardinals on Monday, only for the Cards to return Peralta to DFA limbo when a 40-man roster spot was needed to select Jared Shuster‘s contract from Triple-A.
Peralta’s tenure in St. Louis ends without even a minor league appearance, so his 2026 numbers remain just the ugly 17.18 ERA he posted over six appearances and 7 1/3 innings for the Rockies’ Triple-A affiliate. Peralta has a 10.26 ERA over 43 career Triple-A innings, with the caveat that he has worked only in the hitter-friendly Pacific Coast League.
The southpaw’s time in the majors hasn’t been much better. Peralta had an impressive 0.73 ERA across 12 1/3 innings after he made his MLB debut with Colorado in 2024, but he came back to earth with a 9.47 ERA in 19 frames of work in 2025. Peralta allowed six homers in that 19-inning sample, with more walks (18) than strikeouts (16).
Control has been a persistent issue for Peralta throughout his career, and the problem worsened to the tune of 13 walks allowed over his 7 1/3 innings in Albuquerque this year. Despite his strong strikeout numbers, it will be hard for Peralta to stick even as minor league bullpen depth if he can’t get the ball over the plate.
Chicago becomes the latest team to see if it can solve Peralta’s control woes, and any kind of extra arms are helpful given how the Cubs have six relievers currently on the injured list. Left-handers Caleb Thielbar and Riley Martin are among that sextet, so Peralta can add some depth behind the bullpen’s current southpaw pairing of Hoby Milner and Ryan Rolison.
