Born on 8 January 1990 in Denmark, but an international for Sweden, the talented goalkeeper started his career at the youth ranks of Malmö FF, but didn’t linger there in wait for a first team opportunity. He chose to swith to the academies of BK Olympic, renowned in Sweden for nursing talent. At the age of 16, he got his first transfer to IF Limhamn Bunkeflo and made his debut in the second tier of Swedish football one year later.

A knee injury stalled him for a while, but he bounced back and after spells at Bunkeflo FF and IFK Klagshamn he managed to establish himself as an upcoming goalkeeper in Sweden. In 2011, Malmö FF paid to get him back.
 

Οlsen impressed with his performances for Malmö FF in the UEFA Champions League group stage

Despite being in the shadow of international shot-stopper Johan Dahlin, Olsen gradually got opportunities to feature. He made his debut for Malmö FF in 2012, played in 10 encounters in 2013 and his strong showings forced his club to transfer Dahlin out and make way for young Robin.

Results vindicated the Swedish club, as Olsen established himself and went on to produce spectacular displays that earned him the Best Goalkeper for 2014 award in Sweden and a call for the national squad. He would have liked to become an international for Denmark, to honour his fatherland. But he had to settle for Sweden, where he was born and raised. On 15 January 2015 he made his international debut in the friendly encounter against Ivory Coast and then played against Iran as well.