He is the son of former Vålerenga player Terje Olsen.[2]
After the 2008 season, his contract with Aalesund was not renewed. He initially contemplated retirement,[3] but in late December he was signed by SK Herd together with former teammate Karl Oskar Fjørtoft.[4] From 2012 he continued to play in the lower divisions of Møre og Romsdal.[5]
Embarking on a manager career, he remained as junior and B team coach in SK Herd.[6] He managed Averøykameratene in 2018 before moving on to Tomrefjord.[7] He was hired in IL Valder on a two-year contract ahead of the 2021 season, but was fired after relegation from the 2021 4. divisjon.[8]
^Valderhaug, Bertil (19 September 2008). "Her er Lille Vålerenga" (in Norwegian). Aftenposten. Archived from the original on 24 October 2008. Retrieved 20 October 2012.
^Mordal, Jarle (28 December 2008). "Legger trolig opp". Sunnmørsposten (in Norwegian). Retrieved 27 November 2008.
^Sønsteby, Christian (28 December 2008). "Dette er Lasses nye jobb(er)". Sunnmørsposten (in Norwegian). Retrieved 28 December 2008.
^Edøy, Rune (2 December 2017). "Lasse Olsen trener i AK". Tidens Krav (in Norwegian). p. 27.
^"Går til klubb i samme divisjon". Tidens Krav (in Norwegian). 17 December 2018. p. 17.
^Stenerud, Kristian (17 November 2021). "Fikk sparken etter nedrykket. Hevder juniorlagets satsing bidro til Valders fall". Sunnmørsposten (in Norwegian). p. 13.
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