Borghi is participating in minicamp with the Broncos on a tryout basis, Aric DiLalla of the team's official site reports.
The 23-year-old Washington State product was waived by the Colts about a month ago and still is trying to find some footing in the NFL. Borghi excelled as a pass-catching back in college, but even so he's a long shot to land a spot with the team.