The Rays designated Kimbrel for assignment Monday.
A spot on the 40-man roster was needed for the addition of Freddy Peralta. In 33 appearances between the Mets and Rays this season, Kimbrel has logged a 4.81 ERA and 32:16 K:BB over 33.2 innings. The 38-year-old is a good bet to clear waivers and become a free agent.