There are 12 groups in all, with the top two from each progressing to the last 32, where they are joined by the eight clubs who finish third in their Champions League group.
You can view the full draw on the UEFA website...
Group E
Lazio
Celtic
Rennes
CFR Cluj
Group G
Porto
Young Boys
Feyenoord
Rangers
Fixture dates
MD1: Thursday 19 September
MD2: Thursday 3 October
MD3: Thursday 24 October
MD4: Thursday 7 November
MD5: Thursday 28 November
MD6: Thursday 12 December