Bears' John Fox: Danny Trevathan's knee injury appears 'real serious'

CHICAGO --Bearslinebacker Danny Trevathan suffered a potentially season-ending right knee injury in Chicago's 27-21 loss toTennesseeon Sunday.

"At this point, it appears to be real serious," Bears coach John Fox said. "But we do not have all the tests run to give you a real solid prognosis at this point."

At the 2:52 mark of the fourth quarter, Trevathan charged into the backfield to tackle Titans running back Derrick Henry, but the linebacker's knee appeared to buckle. Trevathan stayed on the ground for over a minute until medical personnel helped him slowly walk off the field.

One of Chicago's team leaders on defense, Trevathan signed a four-year contract in the offseason that contained $12 million in guaranteed money. He is scheduled to count just $3.35 million against the Bears' salary cap in 2017.

Trevathan, who previously played for Fox in Denver, helped the Broncos win Super Bowl 50 last season.

The Bears have lost numerous key players to season-ending injuries, including right guard Kyle Long, wide receiver Kevin White and tight end Zach Miller. Also, wide receiver Alshon Jeffery and linebacker Jerrell Freeman remain suspended for violating the NFL's policy on performance-enhancing substances.