"They're not very excited about injecting elbows, because it softens the ligaments," Collins said.
Edgin, who has not pitched since Aug. 23 due to right elbow tendinitis, also received an injection in New York. The Mets recalled right-hander Erik Goeddel and lefty Dario Alvarez from the Minors earlier this week to insulate their bullpen while those two recover.
Edgin in particular has developed into a cog in New York's bullpen, posting a 1.40 ERA in 41 appearances.
Anthony DiComo is a reporter for MLB.com. Follow him on Twitter @AnthonyDicomo. This story was not subject to the approval of Major League Baseball or its clubs.