Toronto Blue Jays starting pitcher Dustin McGowan will miss the remainer of the 2008 season following surgery on Thursday. ((Elaine Thompson/Canadian Press))

Toronto Blue Jays starter Dustin McGowan will undergo season-ending surgery on Thursday to repair fraying of the labrum in his right shoulder.

The operation on the soft tissue that surrounds the shoulder socket will be performed by Dr. Timothy Kremchek in Cincinnati. The surgeon will also examine a tear in the pitcher's right rotator cuff — an injury that sent him to the disabled list on July 9 — to see if a further procedure is necessary.

"It's going to be quite nervous for all of us, but certainly for him," said Toronto manager Cito Gaston. "Who knows what's going to happen from there, but we're hoping it's just going to be the labrum and that's it."

McGowan (6-7, 4.37 ERA) was forced to leave his July 8 start against the Baltimore Orioles in the fourth inning after just 66 pitches due to unbearable pain in his shoulder.

He initially received a diagnosis that the tear in his rotator cuff was unchanged from last spring and Thursday's surgery will try to confirm that.

The hope is the right-hander won't require any surgery on his rotator cuff and that he will be ready to go next spring.

"That's the best-case scenario," Blue Jays general manager J.P. Ricciardi said. "We always prepare for worst-case scenarios, but hopefully we'll get good news."

With files from the Canadian Press