Shelbourne will face either Paok or Wolfsberger if they reach the play-off round for the Europa League.
The League of Ireland champions will progress if they get the better of Rijeka in their third round tie.
Should they lose that tie, Shels will go into the Conference League play-off round against either Linfield or Vikingur.
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If Shamrock Rovers progress past Ballkani, they'll play either Larne or Santa Clara in the play-off round.
And St Pat's are set to face either FC Lausanne Sport or Astana, if they win their third round tie against Besiktas.
