St Pat's were within seconds of recording their third ever away win in Europe only for Santos Wagner to head home the equalizer with the last touch of the game.
Christy Fagan put the Saints ahead after 12 minutes when Luka Bilobrk pushed John Russell's shot in the strikers path, and he made no mistake from six yards.
The Saints should have been already ahead, but John Russell's penalty was saved by Bilobrk.
The sides meet again in Richmond Park next Thursday to see who will progress to the third qualifying round.
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