Career
He has previously played for Nest-Sotra, Sogndal, Mjøndalen and Fredrikstad. Nilsen was born in Bergen and he started his career with Fyllingen in 2011. Nilsen joined Sogndal in 2014.
He made his debut for Sogndal in a 3-0 defate against Stabæk.
Nilsen joined Mjøndalen in 2015.