Martin Jol's side cruised to a 3-1 first-leg victory in Northern Ireland on Thursday night and will be confident of making it through to the next stage.
Elsewhere Stoke kick off their first ever Europa League campaign against Croatian side Hajduk Split.
Spot on: Fulham look dead certs to progress to the next round
Tony Pulis' side host the former Champions League semi-finalists at the Britannia on July 28 before a return trip to Split on August 4.
And Dundee United will face Metalurg Skopje of Macedonia or Levski Sofia of Bulgaria if they overcome Slask while Hearts will face Hungarian side Paksi or Tromso of Norway.
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