The Mets sent Alvarez outright to Triple-A Syracuse on Thursday.
The Mets designated Alvarez for assignment Tuesday, Anthony DiComo of MLB.com reports.
The Mets acquired Alvarez from the Red Sox on Sunday and selected his contract ahead of Monday's series opener in Toronto.
The Mets acquired Alvarez from the Red Sox on Sunday in exchange for cash considerations.
Alvarez signed a minor-league deal with the Red Sox on Wednesday, Chris Cotillo of The Springfield Republican reports.
The Brewers released Alvarez on Thursday.
Alvarez was reassigned Tuesday to the minor-league side of Brewers camp, Adam McCalvy of MLB.com reports.
Alvarez signed a minor-league with the Brewers on Saturday which includes an invitation to spring training, Todd Rosiak of the Milwaukee Journal Sentinel reports.
The Dodgers released Alvarez (undisclosed) on Monday.