Monell was optioned to Triple-A Las Vegas on Sunday, Adam Rubin of ESPN New York reports. While Monell crushed pitching in Triple-A to being the season, batting .397/.455/.638 with four home runs and 15 RBI in 17 games, it didn't translate to the majors. Over 11 games with the Mets, the backstop went just 1-for-15 at the dish with four strikeouts. He'll be replaced on the 25-man roster by Danny Muno, and with Travis d'Arnaud set to return soon, he will drop further on the totem pole.