Celtic will face either FK Qarabag or FK Rudar Pljevlja in the Champions League third qualifying round if they get past Stjarnan.
The Scottish champions beat Maltese side Stjarnan 2-0 in the first leg of their second-round tie on Wednesday.
Potential opponents Qarabag are the Azerbaijan Premier League champions, while FK Rudar Pljevlja are the champions of Montenegro.
Celtic are back in friendly action on Friday when they face Eibar in Spain.