Vance Joseph notified his three quarterbacks late Tuesday afternoon that there is a shakeup with their position’s depth chart, sources told 9NEWS.

Paxton Lynch will make his first start of the season -- the third of his career -- Sunday when the Denver Broncos play the AFC West Division rival Oakland Raiders in the Black Hole.

Trevor Siemian moves up to No. 2 quarterback and will dress as Lynch’s backup against the Raiders.

Brock Osweiler, who started the Broncos’ previous three games, drops to No. 3.

The move comes as the Broncos have lost six games in a row – the first three started by Siemian, the last three by Osweiler – and a day after Joseph fired offensive coordinator Mike McCoy and replaced him with Bill Musgrave, who had been serving as quarterbacks’ coach.

With the Broncos’ record only 3-7, the quarterback changes have a clear eye on the offseason. The team must find out if Lynch can become a solid NFL starter as he was projected when general manager John Elway moved up to nab him with the No. 26 overall pick in the first round of the 2016 draft.

Siemian is also under contract for a $705,000 salary next year while Osweiler becomes a free agent after this season.

Lynch missed the first two months of the regular season with an injury to his right throwing shoulder suffered in the preseason. Before the injury, he had lost the competition for the season-opening starter position to Siemian, who held the job for seven games.