Yamamoto will join the Marlins' 30-man roster prior to their game against the Orioles on Tuesday, Joe Frisaro of MLB.com reports.
Yamamoto narrowly missed out on a spot in the Marlins' starting rotation to begin the season, but he'll join the pitching staff to fill in during the team's COVID-19 outbreak. According to Barry Jackson of the Miami Herald, manager Don Mattingly said Pablo Lopez and Elieser Hernandez are the only regular rotation members who will definitely be available when the team returns to action Tuesday in Baltimore, so Yamamoto will presumably step in to fill one of the three potential openings on the starting staff. Yamamoto made 15 starts for Miami last season, recording a 4.46 ERA and 82:36 K:BB over 78.2 innings.