On 12 December 2015, he was sent off after an altercation with Miguel Bedoya in an ill-tempered A PFG match against Levski Sofia that was eventually abandoned after the Litex players were ordered off the pitch. Heart of Midlothian. On 22 July 2016, Johnsen completed a move to Scottish Premiership side Heart of Midlothian, on a three-year deal.

