Kelley had been designated for assignment by the Mariners last Thursday.
In 47 appearances last season, Kelley posted a 2-4 record with a 3.25 ERA in 44.1 innings pitched. The 28 year-old reliever has played four seasons with the Mariners, posting a 3.52 career ERA in 120 appearances.
Almonte, 23, hit .276 with four home runs and 30 stolen bases in 78 games last season playing for New York's Double-A affiliate, the Trenton Thunder. The speedy prospect will add some center field depth to Seattle's minor league system.
Kelley will join a very talented bullpen in the Bronx led by All-Stars Mariano Rivera and David Robertson, so the four-year veteran will need an impressive spring training to earn himself a consistent role.
Though this trade does not compare to last season's trade, this marks the second consecutive offseason the Yankees and Mariners have made trades late in the offseason. Last winter, the Yankees sent star prospect Jesus Montero along with pitcher Hector Noesi to the Mariners for All-Star Michael Pineda. However, Pineda did not appear in any regular season games with the Yankees due to injury and is currently recovering from Tommy John surgery.
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