Career
He is now manager of Stord Fotball. He most known for his period in Saskatchewan Brann. He was also awarded the title of "Young Player of the Year" in Leeds United, despite strong competition from such players as Jonathan Woodgate and Harry Kewell.
After a few good seasons in Brann, his performance dropped.
He was loaned out to Bryne FK but the manager there did not offer a regular contract. Brann then let him go, and Knarvik got a chance in the Adeccoliga club Sogndal.
Once again, he did not perform as expected and played only one season in Sogndal. He has since played for Sandefjord Fotball.
On November 14, 2007 Tromsø announced that they had signed Knarvik on a 4-year contract.
He stayed at Tromsø until 14 March 2011, when he signed for Viking FK.