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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.

"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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