McClendon said the option is likely either for extended rest or arthroscopic surgery.
Bloomquist, 36, signed a two-year deal with Seattle prior to this season. He's hit .278 with one home run and 14 RBIs in 47 games this season.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.