Boyer on, Izzy asked to wait, Acosta DFA'd

Blaine Boyer has been informed he has made the Mets' bullpen. Jason Isringhausen has been asked to stay back in Port St. Lucie in extended spring training for two weeks. Manny Acosta has been designated for assignment.

Rule 5 pick Pedro Beato also rounds out the bullpen, with Francisco Rodriguez, Bobby Parnell, Tim Byrdak, D.J. Carrasco and Taylor Buchholz.

Isringhausen has yet to give an official answer. GM Sandy Alderson said he would let Isringhausen walk in a week if a team came and had a major league spot for Isringhausen. Then again, there's no guaranteed spot for Isringhausen in two weeks.,

"We talked to Jason and have asked him to remain in Port St. Lucie for a period of time to continue to pitch, develop arm strength, etc.," Alderson said. "We won't know what he decides until probably tomorrow."

Alderson said the deciding factor was "durability ... in the sense of being able to pitch back-to-back and frequently over periods of days."

Added Alderson: "There's always going to be some injury risk associated with Jason. The next two weeks will tell us a little more about his velocity, a little bit more about how he bounces back from day to day, and it will tell us a little bit more about our own situation in New York with the bullpen."