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Because of language in his contract, the Mets needed Senga’s consent to send him to the minors.
The Mets activated catcher Francisco Alvarez from the injured list and right-handed reliever Wander Suero after they claimed him off waivers from the Atlanta Braves on Thursday.
Alvarez had been on the injured list since suffering an ulnar collateral ligament sprain in his right thumb when he was sliding headfirst into second base Aug. 17 during the Major League Baseball Little League Classic in Williamsport, Pennsylvania. He then saw his return delayed by a fracture in the pinkie finger of his left hand suffered on a hit by pitch while playing for Syracuse.
The UCL sprain will require surgery to fully heal, but the Mets are hopeful Alvarez can postpone the procedure until the offseason.
The Mets are trying to nail down a playoff berth down the stretch. New York began the day four games in front of San Francisco for the final NL wild card and five ahead of Cincinnati. The Mets and Reds are beginning a three-game series Friday.
Catcher Hayden Senger was optioned to Syracuse along with Senga. On Thursday, right-handed reliever Reed Garrett was sent on a rehab assignment to Double-A Binghamton.
Information from ESPN’s Jorge Castillo and The Associated Press was used in this report.