Issah gave his side the lead in the 40th minute
Ghana youth striker Abass Issah scored for the second successive time for Slovenian giants Olimpija Ljubljana who beat ND Gorica side 2-0 on the road.
Issah gave his side the lead in the 40th minute before Blessing Eleke added the second with a quarter of an hour left.
Olimpijia have now won all their two league matches and on top of the table.
Abass was a member of the 2015 Ghana U17 team which got disqualified from playing at the African Junior Championship for fielding an unqualified player.