ENGLEWOOD, Colo. -- The biggest question mark going into training camp for the Broncos remained just that Monday when the team released its first depth chart.
Mark Sanchez and Trevor Siemian were listed as co-No. 1 quarterbacks, three days before the Broncos open the preseason with a game against the Chicago Bears at Soldier Field.
First-round draft pick Paxton Lynch was listed as the No. 3 quarterback.
At practice on Monday, cornerback Aqib Talib was on the field for the first time in training camp. Talib passed his physical after suffering a gunshot wound to his right leg in early June.
Talib had been rehabilitating but because he was on the nonfootball injury list, he could not participate in on-the-field practices.
The shooting, which happened at a Dallas nightclub, remains under investigation. A police report said the bullet entered the back of Talib's right leg and exited through the right calf.
Talib joined the Broncos in 2014 as a free agent, signing a six-year, $57 million contract. He is a three-time Pro Bowl selection.
Mark Sanchez / Trevor Siemian (co-No. 1)
Others: DeVier Posey, Mose Frazier
Other: Justin Murray
Other: Mathu Gibson
Ty Sambrailo / Michael Schofield (co-No. 1)
Other: Robert Myers
Other: Lars Hanson
Jeff Heuerman / Virgil Green (co-No. 1)
Other: Henry Krieger-Coble
Others: Kalif Raymond, Bralon Addison
Ronnie Hillman / Devontae Booker (co-No. 2)
Left defensive end
Other: Lars Koht
Darius Kilgo / Kyle Peko (co-No. 2)
Right defensive end
Other: Calvin Heurtelou
Other: Eddie Yarbrough
Other: Sadat Sulleyman
Other: Frank Shannon
Others: B.J. Lowery
Other: John Tidwell
Shiloh Keo / Will Parks (co-No. 2)
Other: Antonio Glover