The Phillies designated Cyr for assignment Monday.
Just one day after joining the Phillies' 40-man roster and 26-man active roster, he'll cede both spots to fellow reliever Michael Plassmeyer, whose contract was purchased from Triple-A Lehigh Valley ahead of Monday's game against the Reds. The 29-year-old Cyr made his MLB debut in Sunday's 10-9 loss to the Mets, recording just one out while allowing one earned run on two hits.