Sardinas batted .252 in 163 at-bats over 44 games with Triple-A Tacoma.
Sardinas was acquired by the Mariners from the Brewers last offseason in exchange for outfielder Ramon Flores, and he has posted a .218/.257/.268 line in 307 plate appearances over three seasons with the Rangers, Brewers and Mariners.
Sardinas was designated for assignment by Seattle to create room on the 40-man roster for reliever Jarrett Grube, who wound up spending just one day with the Mariners in a series of moves by general manager Jerry Dipoto to bolster the team's short-handed bullpen.
Greg Johns has covered the Mariners since 1997, and for MLB.com since 2011. Follow him on Twitter @GregJohnsMLB and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.