ENGLEWOOD, Colo. — One of the Broncos' most unlikely success stories is moving on.

Denver announced Monday it has traded quarterback Trevor Siemian and a 2018 seventh-round pick (No. 225) to the Minnesota Vikings for a 2019 fifth-round selection.

The former seventh-round pick surprised many in Denver and around the country, as he won the starting job in both 2016 and 2017 and was voted as a captain by his teammates.

After spending a season as the Broncos' third-string quarterback in 2015 as Denver won Super Bowl 50, he started 14 games in 2016 and threw for 3,401 yards, 18 touchdowns and 10 interceptions. Denver raced out to a 6-2 start that season but faltered late in the year, and Siemian was hampered by several injuries.

Siemian, who was named the starter again in 2017, guided Denver to a 3-1 record to begin his second season under center. After three consecutive losses in October, though, Siemian was relieved by Brock Osweiler and later Paxton Lynch. Siemian started three more games as the season continued — leading the Broncos to a shutout win over the Jets — but he suffered a season-ending shoulder injury against the Colts and was placed on the Broncos' injured-reserve list in December.

Denver's trade with the Vikings provides the Broncos with more clarity at the quarterback position.

Free-agent quarterback Case Keenum signed on Thursday, and Paxton Lynch and Chad Kelly also remain on Denver's roster.