January 1: One day after the 2017 regular season finale, the Broncos parted ways with six coaching assistants, firing special teams coordinator Brock Olivo, running backs/assistant head coach Eric Studesville, wide receivers coach Tyke Tolbert, outside linebackers coach Fred Pagac, defensive backs coach Johnnie Lynn and offensive line coach Jeff Davidson. Bill Musgrave, who was promoted to offensive coordinator midway through the 2017 season, shed the interim tag, and remained as the full-time offensive coordinator.[1]
January 3: Sean Kugler was hired as the new offensive line coach, replacing Jeff Davidson. Kugler, who will focus on the guards and centers, was the head coach at the University of Texas at El Paso from 2013–2017, and has previously served as an offensive line coach for the Detroit Lions (2004–2005), Buffalo Bills (2007–2009) and Pittsburgh Steelers (2010–2012).[2]
January 4: Mike Sullivan was hired as the new quarterbacks coach, while Curtis Modkins was hired as running backs coach. Sullivan was the New York Giants' quarterbacks coach and offensive coordinator during the previous three seasons (2015–2017), while Modkins served as the Chicago Bears' running backs coach in 2017. Klint Kubiak, who was promoted to quarterbacks coach after Bill Musgrave was promoted to offensive coordinator midway through the 2017 season, will remain on the Broncos' staff as an offensive assistant.[3]
January 9: Tom McMahon was hired as the new special teams coordinator. McMahon served in the same capacity with the Indianapolis Colts from 2014–2017.[4]
January 10: Chris Strausser was promoted from an offensive assistant to offensive line coach, and will focus on the tackles. Greg Williams was hired as a defensive backs coach, and will focus on the cornerbacks. Williams worked in the same capacity with the Indianapolis Colts during the previous two seasons. Zach Azzanni was hired as wide receivers coach. Azzanni worked in the same capacity with the Chicago Bears in 2017.[5]