Englewood, CO (SportsNetwork.com) - After playing just one game since returning from injured reserve/designated to return, Denver Broncos linebacker Danny Trevathan is likely out for the season with a dislocated kneecap that will require surgery.

Trevathan previously hurt in left knee in Denver's Week 6 game against the New York Jets. He was diagnosed with a fracture above the kneecap and placed on recallable IR, which allowed him to start practicing again late last month.

The third-year pro returned to action for Sunday's game against San Diego, but managed to play just 42 snaps before re-injuring the knee.

Trevathan previously missed Denver's first three games of the season with a broken left tibia.

In 2013, Trevathan led the Broncos in tackles during the team's run to the AFC championship, but he finishes this season with just three games played.

Fellow linebacker Brandon Marshall, who stepped into the starting lineup because of Trevathan's injury, sustained a sprained foot during Denver's division-clinching win over San Diego. His status for the Broncos' game at Cincinnati next Monday is yet unknown.

Broncos head coach John Fox also noted that quarterback Peyton Manning and tackle Ryan Clady are day-to-day with thigh injuries.