Romero signed a minor-league contract with the Giants on Thursday.
The Nationals reassigned Romero to minor-league camp Tuesday, Andrew Golden of The Washington Post reports.
Romero and the Nationals agreed Wednesday to a minor-league contract that includes an invitation to big-league spring training, Bobby Blanco of MASNSports.com reports.
The Nationals declined to tender Romero a contract for 2023, Mark Zuckerman of MASNSports.com reports.
Romero was designated for assignment by the Nationals on Tuesday.
Romero was returned to Triple-A Rochester after starting the second game of Saturday's doubleheader against the Phillies, Jessica Camerato of MLB.com reports.
Romero will start Game 2 of a doubleheader Saturday against the Phillies after Friday's night game was postponed, Bobby Blanco of MASNSports.com reports.
Romero will start Game 2 of Friday's doubleheader against the Phillies, Bobby Blanco of MASNSports.com reports.
Romero was called up to serve as the 29th man for Friday's doubleheader against the Phillies, Mark Zuckerman of MASNSports.com reports.
The Nationals claimed Romero off waivers from the Rays on Thursday and optioned him to Triple-A Rochester, Mark Zuckerman of MASNSports.com reports.