The Blues lead 1-0 going into the second leg with Swedish full timers AIK Solna. In the draw on Friday morning they were paired with either FC Astana or Hapoel Tel Aviv in the third qualifying round.
Meanwhile if Crusaders can come back from 4-0 down to Swedish side Brommapojkarna they would play Italian giants Torino.
In the Champions League, Cliftonville will be up against FC BATE Borisov of Belarus or KS Skënderbeu of Albanian if they can progress past Debreceni VSC.
The game is goalless after the first leg at Solitude this week.
Celtic face a possible tie with Irish title holders St Patrick's Athletic.