Prior to the start of the 2014 season the club sold Johan Dahlin, making Olsen the first choice goalkeeper. In the 2014 season, Olsen made 29 out of 30 league appearances and was a vital piece of the team that defended the clubs league title and qualified for the group stage of the 2014–15 UEFA Champions League. For his performances in the league Olsen was awarded Allsvenskan goalkeeper of the year. He was also nominated for Swedish goalkeeper of the year at Fotbollsgalan.