Ronald Koeman's men were shocked by the Norwegian club and are out of the Europa League, while a Marco Reus hat trick put BVB into the group stage.
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Borussia Dortmund rallied from a shocking three-goal deficit to win 4-3 at Odd Grenland in the Europa League playoff round first leg on Thursday.
Irish champions St Patrick's are out of the Champions League after a 5-0 defeat saw them lose 6-1 on aggregate to Legia Warsaw in the second qualifying round on Wednesday.
Ronny Deila's tenure as Celtic boss began with a narrow but deserved 1-0 win in the first leg of their Champions League second round qualifier against KR Reykjavik, thanks to a late goal from debutant Callum McGregor.