St. Louis Rams outside linebacker Alec Ogletree will be sidelined for at least eight weeks after undergoing surgery Tuesday to repair a fractured right fibula.

Ogletree, who was injured in Sunday's 24-22 victory over the previously unbeaten Arizona Cardinals, will remain on the team's 53-man roster as the Rams opted not to put him on injured reserve.

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"Surgery went really well this morning," St. Louis coach Jeff Fisher told reporters Tuesday. "We have decided not to use the IR designation at this point. So he'll be a Sunday inactive and out. We'll just kind of see how things go and there's a chance for a return."

Ogletree led the Rams in tackles in each of his first two seasons and had recorded 42 through the first four games, including a team-high 10 against the Cardinals. He had two sacks in Week 3 to surpass his total from his first two seasons.

"He was on a tear. Personally, he was on as good of a three-game start as I've seen," Rams middle linebacker James Laurinaitis said of Ogletree. "You really saw his raw talent start to come into form."

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