Arsenal will play Sporting Lisbon in the group stage of the Europa League.
The Gunners have been drawn in Group E of this season’s competition with the Portuguese club, Qarabag of Azerbaijan and Ukrainian side Vorskla.
Chelsea, who won the competition in 2012-13, are in Group L with Greek side PAOK Salonika, BATE Borisov of Belarus and Hungarian side Vidi.
Celtic meet Salzburg, RB Leipzig and Rosenborg while Rangers face Rapid Vienna, Villarreal and Spartak Moscow.
The final of this season’s Europa League takes place in Baku, the capital of Azerbaijan, on 29 May 2019.