Ramirez made three relief appearances for the Yankees earlier this season, but has pitched most of the year for Triple-A Scranton, posting a 2.90 ERA with 10 saves in 32 outings.
Ramirez and outfielder Ramon Flores were acquired in a trade for outfielder Dustin Ackley. Flores has already reported to Tacoma and has hit .438 (7-for-16) in four games.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB, read his Mariners Musings blog, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.