A career .281 hitter in six minor league seasons, Bianchi, 25, played his first full season at Double-A Northwest Arkansas in 2011. He batted .259 with 23 doubles, 20 stolen bases, 63 runs scored and 48 RBI in 119 games last season.
The 5-foot-11, 180-pound Bianchi was a second-round draft pick of the Royals in 2005. He missed the entire 2010 season due to Tommy John surgery on his right elbow.
The Cubs now have 36 players on their 40-man roster.