According to agent Jack Bechta, defensive tackle Kelly Gregg will have microfracture surgery on his left knee today, which would end his season.
Bechta first reported the development on his blog at www.nationalfootballpost.com.
The Ravens have been monitoring Gregg's status since the first week of training camp, when the injury first happened. Gregg required arthroscopic surgery in August to smooth out a bone and even returned to briefly practice with the team until a hole in his cartilage was found.
The hole caused significant pain, but the Ravens were optimistic he could eventually return this year.
If Gregg does have the microfracture surgery, he would not be able to return until May or June of 2009.
The surgery would be performed by renowned orthopedist Dr. James Andrews, who is based out of Birmingham, Ala.
"I had a setback a couple of weeks ago, but I'm working towards coming back," Gregg said in a recent interview. "I took some injections and tried everything. There's really not much else you can do. It's a slow process.
"I've never dealt with anything like this."
Gregg, 6-feet, 315 pounds, actually hasn't missed a game since 2004, when he was held out of two because of a knee injury. The University of Oklahoma product has led all interior defensive linemen in tackles since 2002, registering an eye-opening 597.
The Ravens have employed Justin Bannan in Gregg's place. Bannan currently is fifth on the team in tackles with 16. He also has one sack and notched his first interception last week in a 13-10 loss to the Tennessee Titans.
Stay tuned to BaltimoreRavens.com this week for official word from the team regarding Gregg's status. The Ravens did not offer any comment Tuesday.