The Mets optioned Senger to Triple-A Syracuse on Tuesday.
The 30-year-old was called up to serve as New York's backup catcher in mid-May after Francisco Alvarez (knee) landed on the injured list, but Senger will return to Triple-A with Alvarez coming off the IL on Tuesday. Senger played in just seven games while up in the big leagues and went 2-for-15 with one home run.