Bears linebacker Nick Roach could lose the starting strongside linebacker spot to Pisa Tinoisamoa for a second consecutive time.
Roach had arthroscopic surgery on his left knee today to clean out some debris, according to the team's website.
Roach should be ready for the season opener Sept. 12 against the Detroit Lions, the website added.
"We figured it was a small thing going in," Roach told the website. "Just with the timing of when the regular-season starts, it seemed like the right time to get it fixed, the proactive thing."
Roach and Tinoisamoa were in one of the better training camp battles, with both players having experience and athleticism. In fact, Tinoisamoa looked like he was going to have a solid season in 2009, until suffering a torn ACL in the second game and missing the remainder of the season.
Tinoisamoa has rebounded this offseason, and he takes a clear-cut lead with Roach sidelined after surgery.