Miller missed all of 2020 with an ankle injury suffered in a September practice before the start of the season. The linebacker suffered a dislocated peroneal tendon that has a usual recovery time of five to six months.
The 32-year-old said he was hopeful he would get back on the field before the end of the season, but he never got into a game as the Broncos finished 5-11.
Miller has only had a few significant injuries in his career, with the most notable being a torn ACL in 2013. He returned the next season and played all 16 regular-season games, which he replicated in the next four years.
He played 15 games in 2019, only missing one week because of a knee injury.
When on the field, Miller remains one of the best in the NFL at his position with a Pro Bowl selection in all eight of his healthy seasons. He has been named first-team All-Pro three different times and is almost always a threat to reach double-digit sacks.
He had 4.5 sacks in six games in 2021 entering Thursday.
With his physical attributes and leadership qualities, the Broncos could use him back as soon as possible.