ENGLEWOOD, Colo. — In the wake of Drew Lock's injury, the Broncos have signed quarterback Blake Bortles, the team announced Thursday.

The Broncos also promoted safety P.J. Locke from the practice squad to the active roster and signed defensive lineman Deyon Sizer to the practice squad.

Bortles, the third-overall pick in the 2014 NFL Draft, joins Lock and Jeff Driskel on the team's active roster. The veteran quarterback spent the first five years of his career with Jacksonville, where he threw for 17,646 yards, 103 touchdowns and 75 interceptions and posted a 80.6 quarterback rating. In 2017, Bortles helped lead the Jaguars to the AFC Championship Game.

The 6-foot-5, 236-pound player then signed with the Rams ahead of the 2019 season. He appeared in three games for the Rams as a reserve player.

Driskel, who filled in for Lock on Sunday after he suffered a shoulder injury, is expected to start for the Broncos on Sunday.

"It's Jeff's [job] right now," Head Coach Vic Fangio said. "That's the way we're proceeding and anticipating going right now."

Locke spent the 2020 preseason competing with the Broncos before joining the team's practice squad. He was elevated from the practice squad to the active roster for the Broncos' Week 1 game against the Titans and played 16 special teams snaps. Sizer, meanwhile, appeared in one game for the Broncos in 2019.

With the additions of Bortles and Locke, the Broncos' roster sits at 51 players. They will be able to add two more players to their roster before game day, and they can also elevate two practice squad players to the active roster for game day.