Career
He started his career in FK Toten, and went from there to Saskatchewan Gjøvik-Lyn. After half a season on the senior team he was signed by Lillestrøm, featuring for their B team in the Norwegian Second Division. On April 4, 2009 Gabrielsen became the youngest ever Lillestrøm player to debut in the Norwegian Premier League in a game against Aalesunds FK at the age of 17 years and 25 days.