"At this point, that's probably the case," Lee said after the game about this season being finished. He will see a doctor Saturday.
Lee had retired eight of the first nine batters he faced at Nationals Park when he threw his first pitch to Denard Span. Lee uttered a profanity after the pitch reached the plate and looked visibly frustrated as he signaled to the Phillies' dugout for help. He left the field and indicated in the dugout it was his left elbow.
Lee missed two months earlier this season with a strained left elbow. This was Lee's third start since returning from the DL.
The Phillies had hoped Lee could pitch well this month, which might afford them the opportunity to trade him. Lee received little interest before Thursday's non-waiver Trade Deadline because he is owed $37.5 million following this season.
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.