Celtic have been drawn to face Salzburg, Dinamo Zagreb and Astra Giurgiu in Group D of the Europa League.
The Scottish champions avoided meeting Legia Warsaw, the side who they controversially beat in Champions League qualifying due to a technicality, and take the second seed in Group D alongside Salzburg, Dinamo Zagreb and Astra Giurgiu.
Celtic manager Ronny Deila believes now is the time to put aside the disappointment of losing out to Maribor in the Champions League play-offs.
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He told UEFA.com: "It's an interesting group. There are good teams but we are going to fight to go through.
"We are disappointed we didn't make the Champions League but we have to close this chapter for this year and remember the feeling we had.
"We have to work really hard, learn from our defeats and use that experience when we hopefully get in that situation again next year.
"We are going to focus on the 50 or so games we have left and we will do everything to win the league, cups and do well in Europe."
September 18: Salzburg v Celtic
Octover 2: Celtic v Dinamo
October 23: Celtic v Astra
November 6: Astra v Celtic
November 27: Celtic v Salzurg
December 11: Dinamo v Celtic