By Chris Emma–

CHICAGO (CBS) — The Bears will be cautious with some of their key players returning from injury in Thursday’s preseason opener, holding out a lengthy list from action.

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Offensive lineman Kyle Long, linebacker Danny Trevathan and edge rusher Lamarr Houston are among Bears not expected to play, as the team announced 90 minutes prior to kickoff. Quarterback Connor Shaw, receiver Markus Wheaton, receiver Daniel Braverman, safety Harold Jones-Quartey and running back Jeremy Langford will be sidelined due to injury, as expected.

Long, Trevathan and Houston are each returning from major surgeries and offseason recoveries. Long suffered an ankle injury in November; Trevathan had surgery for a torn patellar tendon in December; and Houston suffered a torn ACL in September. They’ve participated in some role during the early portion of training camp but are yet to be fully active in practice.

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The Bears will work in three quarterback Thursday, with Mike Glennon and Mark Sanchez expected to play in the first half and rookie Mitchell Trubisky set to play much of the second half.

Kickoff between the Bears and Broncos comes at 7 p.m. from Soldier Field.

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Chris Emma covers the Bears, Chicago’s sports scene and more for Follow him on Twitter @CEmma670 and like his Facebook page.