[1] After a year at a nearby efterskole, where he played for Aulum IF, Friis joined Ikast FS, competing at the top youth levels before the formation of Midtjylland.
[1] He later returned to FHIF to start his senior career but was forced to retire at age 23 due to a cruciate ligament injury.
[1] Friis began his coaching career in 1999 at Midtjylland, where he was until 2015, when he also left the club shortly after Glen Riddersholm's departure.
In the spring of 2018, he was offered to join Brentford as a development coach, [3] but after a year he returned to AGF as an assistant, now for David Nielsen.
[7] On 16 December 2022, Friis was hired as an assistant coach to Sparta Prague manager Brian Priske.