Montgomery's next start has been pushed back to Thursday against the Giants, Gordon Wittenmyer of the Chicago Sun-Times reports.

EDGE Analysis

The Cubs will flip Montgomery and Jason Hammel in the rotation, giving Montgomery an extra day of rest after he threw a season-high 91 pitches in his last outing. Montgomery has fared reasonably well as a starter, posting a 3.48 ERA and 1.31 WHIP in four starts (compared to 2.29 ERA and 1.17 WHIP in relief), but his run in the rotation may end when John Lackey (shoulder) is cleared to return. That is, unless the Cubs opt to go with a six-man rotation down the stretch.