Small was optioned to Triple-A Nashville following the first game of Monday's doubleheader against the Cubs.
Small made his major-league debut as the starter in Monday's matinee, and he allowed two runs on four hits and four walks while striking out four in 2.2 innings. While it wouldn't be surprising to see the southpaw claim a more permanent rotation spot at some point this year, he'll head back to Nashville, where he's posted a 1.88 ERA and 1.13 WHIP in 38.1 innings over eight starts this year.