LAKE FOREST, Ill. -- Chicago Bears cornerback Jaylon Johnson will undergo surgery to repair a core muscle injury but could return at some point this season, coach Ben Johnson said Monday.

The 26-year-old cornerback was placed on injured reserve over the weekend and won't be eligible to return until the Bears' Week 8 game against the Baltimore Ravens .

Johnson had been dealing with a groin injury that cost him all of training camp, the preseason and Chicago's season opener against the Minnesota Vikings . He returned for the Bears' Week 2 contest at Detroit but was ruled out of the game in the second quarter with a groin injury after diving to break up a pass.

Ben Johnson said the star cornerback suffered a "new" injury in Detroit, which sources told ESPN is a core muscle injury

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