Joseph did not commit to a starter after the second preseason game.
Siemian and Lynch have each started one preseason game.
Lynch was 9 of 13 and showed good pocket presence by scrambling out of trouble a few times, but managed only 39 yards through the air in less than two quarters.
Siemian won the starting job over Lynch last preseason as well, but the team re-opened the competition this offseason on hopes that Lynch could develop.
Siemian was asked if he had done enough to win the job, and the third-year pro replied: "I think so".
"I'm not sure, once we watch this tape and see where we are with that", Joseph said on KUSA's television broadcast. He's expected to complete 308.0-of-519.4 (59.3 percent) passes for 3,306.0 yards with 18.96 touchdowns and 14.3 interceptions in 2017. "Still, no doubt, I have a long way to go again, but yeah, I think that's it". Lynch is 15-of-22 for 81 yards with zero touchdowns and a passer rating of 74.2. He hasn't thrown an interception. "Our time frame is not important, but getting it right is".
Siemian, who played most of last season with a left (non-throwing) shoulder injury that required surgery, finished 8-6 as a starter in 2016.