The Cubs claimed Peralta off waivers from the Cardinals on Sunday and optioned him to Triple-A Iowa, Taylor McGregor of Marquee Sports Network reports.
Peralta was designated for assignment by the Cardinals on Friday but quickly found a home in a new organization willing to dedicate a 40-man roster spot to him. The southpaw never made an appearance in the Cardinals organization, but he posted an inflated 17.18 ERA and 3.24 WHIP with 14 strikeouts over 7.1 innings in six appearances with the Rockies' Triple-A affiliate in Albuquerque this season. Peralta has the ability to punch out batters, but he'll need to greatly limit the damage against him at Iowa before receiving a look in Chicago's bullpen.