Smeltzer was optioned to the Twins' alternate training site Monday, Brandon Warne of ZoneCoverage.com reports.
Smeltzer has thrown 16 innings for the Twins this season, making one start and six relief appearances. His 6.75 ERA and 1.50 WHIP are both rather unimpressive. Cody Stashak (back) returned from the injured list in a corresponding move.