The 27-year-old Gambian international came off the bench to score the only goal of the game for Hammarby in the 77th minute with a well-placed shot.
The Bundung-born player moved to the Swedish side after leaving United Arab Emirati side Ajman.
‘Steve’ as he is fondly called scored 20 goals during his three years with Ajman.
This victory moved Hammarby to 3rd position with 36 points after 18 matches.
