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Bears rookie LB Jack Sanborn out for season with ankle injury

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Sanborn made the team as an undrafted free agent and eventually replaced Roquan Smith as a starter.

Bears rookie linebacker Jack Sanborn, one of the team’s bigger developmental success stories, is out for the rest of the season after suffering a left ankle injury against the Eagles.

The Bears have three games left, starting Saturday against the Bills. Coach Matt Eberflus downplayed the severity of the injury Tuesday, saying if it had happened earlier in the season, Sanborn would’ve been expected to return.

Sanborn, from Lake Zurich High School, made the team as an undrafted free agent out of Wisconsin and played 14 games, including six starts.