The team's starting tight end will be sidelined for the rest of training camp after suffering a setback with his surgically repaired left knee, The Denver Post reported Saturday.
It's a sudden turn of events for Dreessen, who had been practicing without any reported issues through Friday. He sat out the team's scrimmage on Saturday because of pain in the knee, according to USA Today.
It's unclear if Dreessen will miss the start of the regular season following his latest setback. At the very least, legitimate uncertainty now is involved.