The Cubs designated Wilson for assignment Saturday.
Wilson joined Chicago as a waiver claim June 24 and made two appearances for the team. In his first outing, he impressed with 4.1 scoreless innings, but the right-hander then got pounded for seven runs across 3.1 frames against St. Louis on Friday. He's now lost his spot in Chicago's bullpen (and on the team's 40-man roster) in favor of Jake Woodford, who was inked to a major-league contract Saturday.