Last week, Head Coach John Fox said Bailey was "making great progress."
"He's being watched over by our medical staff and he's getting closer," Fox said last Friday.
Bailey suffered a foot injury in the Broncos' second preseason game against the Seattle Seahawks and has not participated in any practices in the regular season.
Dreessen underwent a knee scope in early August during training camp, which opened the door for tight end
As for the players' official participation in Thursday's practice, that is yet to be determined. Fox will release the full injury report at the conclusion of the session.
Click here to view photos of Bailey's return to practice.