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ENGLEWOOD, Colo. —** Amid a press conference dominated by the news that Trevor Siemian had been named the Broncos' starting quarterback, Head Coach Vance Joseph also announced that rookie Garett Bolles has earned the starting job at left tackle.

"Garett Bolles is going to be the left tackle, for sure," Joseph said. "He's won that job."

Joseph had pegged Bolles as the first-team left tackle when the team's first depth chart was released, but the head coach said at the time that Bolles was still competing with Donald Stephenson and Ty Sambrailo.

Bolles also refused to be complacent knowing that he'd have to continue to prove himself throughout the preseason to earn his spot as a starter.

"I have four preseason games to earn my spot, so I'm just going to continue to work hard every single day," Bolles said on Aug. 7. "I have Ty Sambrailo and Don pushing me every single day. Until it's official on Week 1, then that doesn't faze me."

On Monday, Joseph also noted that the starter at left guard has not been decided.

"The left guard is still open between Max Garcia and [Allen] Barbre," Joseph said. "So those guys will split time this week in the first half and probably some in the third quarter."

Saturday's game against the Packers, which is expected to be the last preseason action for starters, could decide the regular-season starter.

One person not being considered for the left guard spot is Ron Leary, who has played the position for much of his career but moved to right guard during the offseason.

"He's played really well at right," Joseph said, "so he'll be right for right now."