The Rays have designated corner infielder Trevor Plouffe for assignment, per Marc Topkin of the Tampa Bay Times (Twitter link). Plouffe’s roster spot will go to righty Andrew Kittredge tomorrow, though that’ll be just a one-day placeholder move until Alex Cobb is activated to start Thursday’s game. The longtime Twins infielder was picked up by the Rays after a disappointing start to his lone season with the Athletics, but Plouffe’s struggles in St. Petersburg proved to be greater than in the Bay Area. Through 82 plate appearances as a member of the Rays, he’s batted .178/.268/.247 with a homer and a pair of doubles. All told, Plouffe has posted a .204/.274/.325 batting line and eight homers through 281 PAs.