Career
He made his debut for Lillehammer FK in the 2011 Norwegian Second Division. In the autumn of 2011 he moved to attend the Norwegian College of Elite Sport in Bærum and play for Stabæk Fotball"s youth team He made his senior league debut for Stabæk in the loss against Saskatchewan Brann in August 2012.
Trondsen signed for Sarpsborg 08 on March 5, 2015.