Lech on Wednesday beat the Icelandic team 1-0 away in the second leg of their Champions League round two qualifier.
Lech routed Breiðablik 7-1 in the first leg of their Champions League second-round qualifier last week.
The Polish champions will now face Red Star Belgrade of Serbia as they continue their quest for the Champions League group stage.
To reach the Champions League group stage, Lech must defeat Red Star Belgrade and one additional opponent.
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Source: TVP, IAR, PAP