Bobby Parnell indicated Thursday that team doctors have told him it is “50-50” whether he will require Tommy John surgery.

The injured closer added that he may make a decision about whether to have surgery in two weeks -- not wait the full six weeks that includes a throwing program Sandy Alderson laid out Wednesday.

That’s because Tommy John surgery has a 10- to 14-month recovery time, and Parnell wants to ensure he does not affect his availability for 2015 if he needs to proceed with the ligament-replacement surgery.

“I want to make sure if I do have surgery I give myself the best bet to get back for next year and have the recovery time,” Parnell said.

Parnell was dispatched for an MRI of his pitching elbow on Tuesday’s off-day after blowing the save on Opening Day. He was diagnosed with a partial tear of the medial collateral ligament.