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Carson will give the Mets a second lefty in the bullpen for three games. He will likely be optioned back down to the minors when the Mets need to call up Schwinden.

“We can’t hold our heads down and worry about the things we don’t have,” manager Terry Collins said. “We’re just going to have to pick each other up as we’ve done in the past.”

Mike Baxter started in left field Tuesday night and Collins juggled his lineup, putting David Wright in the cleanup spot instead of his usual No. 3 hole. Scott Hairston and rookie Jordany Valdespin, a versatile infielder called up from the minors Monday, are other options in left.

Bay can’t do much besides ride a stationary bike until the injury heals and he begins to feel better.

“Hopefully, this isn’t an extended period of time,” Bay said. “It’s one of those things you can’t actively work through. That’s the frustrating thing. … This is just a lot of waiting at first.”

One piece of positive news for the Mets: New center fielder Andres Torres (strained calf) was scheduled to play four minor league rehab games this week before rejoining the team in time for a series that begins Monday in Houston. Torres, acquired from the Giants in an offseason trade, was put on the disabled list after re-injuring his left calf on opening day.