Bertilsson after one junior season at the under 18 level with Bofors IK, moved to Brynäs IF in 2007.

Bertilsson played the first 11 years of his professional career in the Swedish Hockey League (SHL) with Brynäs before leaving as a free agent following the 2018–19 season.

In his first venture abroad, Bertilsson signed a one-year contract with Russian club, HC Sochi of the Kontinental Hockey League, on May 1, 2019.

On 15 July 2020, Bertilsson opted to return to his original club after just one season away, agreeing to a four-year contract with Brynäs IF to resume his SHL career.

This biographical article relating to a Swedish ice hockey defenceman is a stub.