Singleton, a fellow veteran starter coming off a 2024 ACL tear, suffered a broken thumb on Monday that was expected to keep him sidelined for about a week. He underwent corrective surgery but, like Greenlaw, has since been seen at Broncos Park.

In an alarming sight for an already-banged-up inside linebacker room, Dre Greenlaw pulled up with a grimace after covering J.K. Dobbins in team drills.

Greenlaw will serve as one of the two starting inside linebackers in defensive coordinator Vance Joseph's scheme this fall. He will be joined by Alex Singleton (after Singleton returns from a broken thumb with a club) when the Broncos host the Tennessee Titans in their season opener on Sept. 7 ( view the full schedule ).