Phillies left-hander John Lannan left Wednesday night's start with a left knee problem, and Matt Gelb of the Philadelphia Inquirer reports the injury may be season-ending. There is a structural issue with the knee and surgery may be required.
Lannan, 28, left the game with one out in the second inning and there was no obvious play where he may have hurt himself. The Braves tagged him for five runs on four hits and three walks in those 1 1/3 innings, suggesting he may not have been 100 percent physically.
In 13 starts coming into Wednesday, Lannan had gone 3-5 with a 4.81 ERA and 1.45 WHIP. He took the loss and saw his ERA rise to 5.33 after getting pummelled by Atlanta in what figures to be his final start of 2013.
A left quad tendon strain shelved Lannan for two months earlier this season. He missed a few days with left knee soreness back in 2011, but that's the only other time it's given him trouble.
The Phillies signed the veteran southpaw to a one-year, $2.5 million contract this winter. They can retain him as an arbitration-eligible player next year.