After the Broncos’ season came to an end on Sunday, the team surprisingly parted ways with six different assistant coaches, many of them popular with the team’s most significant players. On Friday, the team announced replacements for three of them.

Mike Sullivan will replace Bill Musgrave as quarterbacks coach after the latter was pulling double-duty after his mid-season promotion to offensive coordinator. Sullivan, a 23-year coaching veteran, served as offensive coordinator for the Giants the last two seasons and took over offensive play-calling for the team in Week 6 and continued that responsibility through the remainder of the year.

Curtis Modkins replaces longtime running backs coach Eric Studesville, who served as the Broncos’ interim head coach in 2010. Modkins has spent the last 10 years in the NFL as an offensive coordinator or running backs coach, working with three different 1,000-yard rushers during that span: C.J. Spiller (1,244 yds.) with Buffalo in 2012, Reggie Bush (1,006 yds.) with Detroit in 2013 and Jordan Howard (1,122 yds.) with Chicago in 2017.

Sean Kugler will replace Jeff Davidson, who served as the Broncos’ offensive line coach for less than a calendar year– to a certain extent. The Broncos named Kugler offensive line coach (guards/centers), splitting up the traditional duties of a single coach into two. Kugler has 18 years of experience coaching offensive lines, 12 of them in the NFL, with stops in Detroit (2001-05), Buffalo (2007-09) and Pittsburgh (2010-12). Former Broncos tackle Ryan Clady earned first-team All-America honors playing under Kugler as Boise State finished the 2006 season with a perfect 13-0 record and the school’s first-ever BCS Bowl game berth.