Adkins (undisclosed) did not participate in Saturday's training camp practice, Zac Stevens of TheDNVR.com reports.
Adkins left Friday's practice with a trainer, but the nature and severity of the injury is not clear. He appeared in nine regular-season games for the Broncos last year, finishing with six catches (on 11 targets) for 48 yards and a touchdown. Adkins is competing against rookie fifth-rounder Justin Joly for the TE3 role behind Evan Engram and Adam Trautman.