The Brewers announced Friday that Alvarez joined the organization as an assistant in the baseball operations department.
Alvarez is rehabbing his Achilles in hopes of returning to the majors in 2019, Jon Heyman of MLB Network reports.
Alvarez opted out of his minor-league contract Saturday with the Marlins and has 48 hours whether to remain in the organization, Andre Fernandez of The Athletic reports.
Alvarez went 2-for-2 with two home runs, three runs scored and five RBI in Saturday's spring game against the Mets.
Alvarez signed a minor-league contract with the Marlins on Monday which includes an invitation to spring training, Joe Frisaro of MLB.com reports.
Alvarez elected free agency Thursday, Baseball America reports.
Alvarez was moved to the 7-day disabled list Friday due to an Achilles injury, David Hall of The Virginian-Pilot reports.
The Orioles outrighted Alvarez to Triple-A Norfolk.
Alvarez was designated for assignment by the Orioles on Tuesday.
Alvarez (hamstring) is hitting eighth as the designated hitter Tuesday against the Phillies, Roch Kubatko of MASN Sports reports.