LAKELAND, Fla.– The Mets’ injury problems continued to mount after the team learned Monday that reliever Tim Byrdak had been diagnosed with a torn meniscus in his left knee on the same day David Wright received an ultrasound-guided cortisone shot in his left rib cage.

Byrdak will have arthroscopic surgery in New York on Tuesday and is expected to be sidelined for six weeks, so the Mets will be looking for another lefty reliever, because GM Sandy Alderson believes the team will have a southpaw in the bullpen on Opening Day.

“We have a number of options,” Alderson said.

The GM mentioned pitchers already in camp (Robert Carson, Chuck James and Garrett Olsen), as well as Josh Edgin, a 25-year-old who hasn’t pitched above Single-A but moved to major-league camp Monday.

The team could sign free agent C.J. Nitkowski, who worked out for the Mets last week, although Alderson said that wouldn’t happen for “a couple of days.”

Byrdak’s injury will leave a hole in the pen.

“Obviously, this will impact our left-handed situation, since he will miss some portion of the regular season and we’ll have to accommodate that,” said Alderson, adding that ideally the Mets would have a southpaw in the pen and “this injury notwithstanding, I expect we still will.”