JUPITER, Fla. - Bobby Parnell strained his left hamstring during pitchers' fielding practice about a week ago, pushing back what was to be his return to action.

Parnell was initially slated to pitch Wednesday in his first game action since Tommy John surgery.

But the injury has limited the Mets' reliever to throwing on flat ground only.

"He's been able to throw all the way through," pitching coach Dan Warthen said after the Mets' 7-4 loss to the Marlins. "He just hasn't been able to get on the mound."

Warthen said Parnell is playing catch with no pain and could be ready for game action in three or four days.

Awaiting word on Edgin

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Primary lefthanded reliever Josh Edgin visited with doctors in New York Wednesday, one day after an MRI exam. But team officials had yet to be updated on his status.

Edgin raised red flags with his diminished velocity during camp and later complained of elbow discomfort. Edgin endured elbow issues late last season.

Scott Rice, one of the lefties vying for a bullpen spot, allowed four runs (five earned) in two-thirds of an inning.

Extra bases

Former first rounder Michael Conforto finished 1-for-5 yesterday, the second time he was invited to big league camp to play in a Grapefruit League game . . . Lucas Duda could be ready for his first game action of the spring on Sunday, manager Terry Collins said. Duda has been sidelined from games with a strained intercostal . . . Dillon Gee allowed one hit in 11/3 innings as he continued his transition from starter to reliever. Gee allowed an inherited runner to score in the seventh. Said Collins: "We're going to continue to run him out in those situations."