Stock signed a minor-league contract with the Brewers on Thursday that includes an invitation to spring training, per Adam McCalvy of MLB.com.
Stock (hamstring) elected free agency after refusing an outright assignment to Triple-A Syracuse on Friday.
The Mets transferred Stock (hamstring) from the 10-day injured list to the 60-day IL on Friday.
Stock was placed on the 10-day injured list with a right hamstring strain Wednesday, Deesha Thosar of the New York Daily News reports.
Stock was removed from Tuesday's game against the Reds with a right hamstring injury, Tim Healey of Newsday reports.
Stock was recalled from Triple-A Syracuse to start Tuesday's game at Cincinnati, Anthony DiComo of MLB.com reports.
The Mets are "leaning toward" calling up Stock from Triple-A Syracuse to start Tuesday's game in Cincinnati, Mike Puma of the New York Post reports.
Stock was optioned to Triple-A Syracuse on Thursday, Tim Healey of Newsday reports.
Stock (0-2) took the loss in the second game of Wednesday's doubleheader against the Brewers, allowing two runs on four hits and two walks over four innings as the Mets fell 5-0. He struck out five.
Stock was recalled from Triple-A Syracuse on Tuesday and is expected to start Wednesday versus the Brewers, Deesha Thosar of the New York Daily News reports.