Carroll never received an opportunity for playing time, as he was stuck behind future NFL quarterback Kyle Orton.

After being reassigned to the Triple-A Louisville Bats, Carroll would spend the season there, registering a 7–8 record and 5.39 ERA with 85 strikeouts in 145+1⁄3 innings pitched across 25 starts.

[4] Carroll pitched in one game with the Double-A Birmingham Barons before being promoted to the Triple-A affiliate Charlotte Knights.

He finished the 2013 season with a combined record of 0–2 in 11 games (11 starts), 41+0⁄3 innings, 3.29 ERA, 42 hits, 6 walks and 29 strikeouts.

[6] In his rookie campaign, Carroll made 26 appearances (19 starts) for Chicago, registering a 5–10 record and 4.80 ERA with 64 strikeouts in 129+1⁄3 innings pitched.

[10] After beginning the year with Charlotte, Carroll was selected to the active roster on April 26, after Eric Surkamp was designated for assignment.

[12] In 3 appearances for Chicago, he struggled badly, allowing 3 runs on 2 hits and one walk with 2 strikeouts in 2+1⁄3 innings pitched.

[14] He made 2 starts for the Triple-A Round Rock Express, but struggled and was demoted to the Double-A Frisco RoughRiders.

[17] He made 4 starts for the Triple-A Iowa Cubs, registering a 2–1 record and 3.68 ERA with 16 strikeouts in 22.0 innings pitched.

[18] On June 2, 2018, Carroll signed with the Kansas City T-Bones of the independent American Association of Professional Baseball.