The Bears have agreed to sign free agent inside linebacker Danny Trevathan, a source told ESPN’s Adam Schefter.

Trevathan, 25, led the Super Bowl champion Denver Broncos defense in tackles last season and was a key contributor to their title run. The Bears had an inside track at signing him due to his familiarity with John Fox, who coached Trevathan in Denver for the linebacker’s first three seasons in the league.

The Bears badly needed help in the middle of the field, where veteran Shea McClellin and Christian Jones failed to make much of an impact. Trevathan is a little undersized for the position but has great speed an instincts to make plays in the passing game — in addition to being a run stopper.

With outside linebacker Pernell McPhee — last year’s big free agent addition — teaming up with Trevathan, the Bears are starting to put together a formidable linebacking corps. Willie Young and Lamarr Houston showed some ability to rush the passer from the outside after transitioning from 4-3 defensive ends to 3-4 outside ‘backers.

The Bears will likely turn their attention to the defensive line in April’s draft, but they could also be targeting Akiem Hicks, per Brad Biggs of the Chicago Tribune.