Alvarez announced Sunday via his personal Twitter account that he return to the Milwaukee Milkmen of the American Association of Independent Professional Baseball after he wasn't able to finalize a minor-league contract with the Pirates.

Alvarez is signing a minor-league deal with the Pirates on Sunday, Russell Dorsey of the Chicago Sun-Times reports.

Alvarez was reassigned to minor-league camp on Saturday, Byron Kerr of MASN Sports reports.

Alvarez signed with Tigres de Quintana Roo in the Mexican Baseball League on Friday, Jon Heyman of FanRagSports.com reports.

Alvarez cleared waivers and will in turn become a free agent.

Alvarez (0-1) allowed four runs on four hits and two walks while striking out four batters through five innings while taking the loss to Oakland on Sunday.

Manager Pete Mackanin said Alvarez will start Sunday against Oakland, Jim Salisbury of CSN Philadelphia reports.

Alvarez had his contract purchased from Triple-A Lehigh Valley on Monday, Jon Heyman of FanRagSports.com reports.

Alvarez agreed to a minor-league contract with the Phillies on Tuesday, Jesse Sanchez of MLB.com reports.

Alvarez (shoulder) says he will throw a bullpen session in March for interested teams, Manolo Hernandez of Beisbol Porgotas reports.