Yamamoto was recalled by the Marlins on Tuesday.
Yamamoto was optioned to the Marlins' alternate training site following a rough start in the middle of August, but he'll return to the major-league pitching staff. It's unclear when he'll make his first appearance, but the Marlins are scheduled to play four doubleheaders over the next two weeks, so he may very well be needed as a starter. The right-hander has struggled to an 11.42 ERA and 2.42 WHIP over 8.2 innings so far this season.