Plouffe was released by the Phillies on Thursday, Scott Lauber of The Philadelphia Inquirer reports.
Plouffe went 1-for-2 with a solo homer Wednesday against the Blue Jays.
Plouffe signed a minor-league contract with the Phillies on Wednesday, Brandon Warne of ZoneCoverage.com reports.
Plouffe was outrighted to Triple-A Lehigh Valley on Sunday.
Plouffe was designated for assignment by the Phillies on Tuesday, Meghan Montemurro of The Athletic Philadelphia reports.
Plouffe was 1-for-3 with a walkoff three-run home run during the 16th inning to lift the Phillies over the Dodgers on Tuesday.
Plouffe's contract was selected by the Phillies on Tuesday.
Plouffe requested and was granted his release from Triple-A Round Rock on Tuesday, Evan Grant of The Dallas Morning News reports.
Plouffe (intercostal) is batting sixth during Monday's Cactus League game against the Giants.
Plouffe (intercostal strain) is hoping to return to action Monday, Dave Sessions of MLB.com reports.