The Red Sox signed Westbrook to a minor-league contract Monday with an invitation to major-league spring training.
Westbrook was reassigned to minor-league camp Wednesday by the Yankees.
Westbrook signed a minor-league contract with the Yankees on Saturday, Conor Foley of The Scranton Times-Tribune reports.
Westbrook was traded from the Brewers to the Tigers on Wednesday in exchange for cash considerations, Adam McCalvy of MLB.com reports.
Westbrook signed a minor-league contract with the Brewers on Monday.
Westbrook was released by the Giants on Friday, Alex Pavlovic of NBC Sports Bay Area reports.
Westbrook signed a contract with the Giants on Monday, which includes an invitation to spring training, Amy Gutierrez of NBC Sports Bay Area reports.
Westbrook suffered a minor knee injury in Sunday's Double-A action, Zach Buchanan of The Athletic Arizona reports.
Westbrook, 20, is slashing .294/.353/.399 with two home runs, 15 RBI and three steals in 41 games for Double-A Mobile.