Mark Sanchez
The Broncos just named Trevor Siemian the starting quarterback for the 2016 season and are reportedly attempting to trade Sanchez.
If no trade is struck, he could become a free agent when the Broncos trim down to their final 53-man roster. Sanchez is certainly no Romo, but he would be adequate as a backup behind Prescott.
While he struggled with some with turnovers in the preseason, Sanchez still managed to complete 20-of-30 passes and throw for 219 yards and one touchdown in his limited time.
Furthermore, over the course of his 13 games played in the last two years with the Philadelphia Eagles, Sanchez completed an average of 64.3 percent of his passes. This is much improved from the 55.1 percent he averaged during his four-year tenure with the New York Jets.
At the least, Sanchez would have a positive attitude and be willing to work in whatever role is designated to him.