The Cubs optioned Rucker to Triple-A Iowa on Sunday.
With the Cubs needing to clear a spot on the 26-man active roster for Sunday's starter Drew Smyly (oblique) to return from the 15-day injured list, Rucker was deemed an expendable piece. During his one-week stint with the big club, Rucker logged three appearances out of the bullpen and gave up two earned runs on four hits and no walks over 4.1 innings.