The draw was made earlier this afternoon
The League of Ireland champions will get to face the Gunners twice in the coming months, after being put in Group B of the competition.
Filippo Giovagnoli's side have also been drawn with Molde of Norway and Austrian side Rapid Vienna.
Meanwhile Celtic have been given a tough draw in Group H alongside AC Milan, Lille and Sparta Prague.
Spurs are to face Ludogorets, LASK and Antwerp.
While Leicester City have Braga, AEK Athens and Zorya Luhansk.
The first round of games are set to take place on the 22nd of October.
