With the Cubs expected to go with a four-man rotation through the current road trip due to off days Thursday and Monday, Alec Mills, who made two starts over the last week, was optioned to Triple-A Iowa, per a press release from the team, and lefthanded reliever Tim Collins was recalled and added back to the 40-man roster.
Collins will be in his fourth stint with the Cubs this year. He posted a 3.52 ERA in eight relief outings covering 7u2154 innings during his first three stints from April 10-25, May 25-26 and June 13-19.