The Marlins designated Wallach for assignment on Saturday, Christina De Nicola of MLB.com reports.
The catcher was recalled before Friday's game and struck out in his only plate appearance. Wallach has appeared in 23 total games for the Marlins this season, hitting .200 with six RBI and 32 strikeouts. He was DFA'd to make room on the 40-man roster for Brian Anderson, whom the team activated from the 60-day injured list Saturday.