According to Adam Rubin of ESPN NY, Ronny Cedeno is expected to land on the disabled list before today's doubleheader.
Middle infielder (and now center fielder) Jordany Valdespin as well as right-hander Jeremy Hefner are due to be at Citi Field as part of a taxi squad. They are allowed to be with the team for 24 hours without being activated.
The expectation is Hefner would be activated to back up Miguel Batista. Then the Mets can add Valdespin in that spot after getting through the doubleheader.
The taxi squad is new under the collective bargaining agreement. Josh Satin similarly was brought to Philly last road trip without being activated because of uncertainty about David Wright's pinkie. No injury uncertainty needs to exist, though. Any taxi squad player just needs to leave the following day if he's not joining the 25-man roster.
Valdespin, 24, was hitting .276 with two homers and seven RBIs in 76 at-bats with Triple-A Buffalo. He has appeared in center field -- a new position for him in the Mets organization -- in 14 of his 17 games.