By Andrew Porter

PHILADELPHIA (CBS) — He’s not sure where and he’s not sure when, but’s Jim Salisbury says a “baseball source with knowledge” tells him that “Jonathan Papelbon will be traded.”

The Nationals are reportedly interested in Papelbon, but the 34-year-old Phillies closer has made it clear he wants to remain a closer. Papelbon can block a trade to the Nats, who already have a viable closer in Drew Storen. Storen, 27, is third in the National League with 29 saves.

Papelbon has a $13 million option for next season, which will become guaranteed after he finishes 14 more games. Therefore, it is likely Pap would clear waivers, meaning he could still be traded after Friday’s (4 p.m.) non-waiver trade deadline.