With the final play-off rounds to come, as it stands, we could just get into Pot 1 but as Somniloquism has pointed out there are quite a few ifs and buts yet...e.g. if Fenerbahce beat Benfica in CL qualifying, we will go to Pot 2.
Clubs in Bold are definitely in the Europa League, the rest are projected.
Pot 1
Roma
Porto
Rangers
Feyenoord
Lille
Dinamo Zagreb
Real Betis
Salzburg
Aston Villa
Pot 2
Fenerbahce.
Braga
Lyon
PAOK Salonika
Viktoria Plzen
Maccabi Tel Aviv
Slovan Bratislava
Basel
Midtjylland
Pot 3
Qarabag
Freiburg
Ludogorets
Nottingham Forest
Sturm Graz
FCSB
Nice
Bologna
Celta Vigo
Pot 4
Stuttgart
Panathinaikos
Malmo
Go Ahead Eagles
Utrecht
Genk
Pafos
AEK Larnaca
Kairat Almaty
The alternatives for those clubs above which have not yet definitely qualified are:
Losers from Champions League Play-Off round
Bodo Glimt (Sturm Graz)
Ferencvaros (Qarabag)
Celtic (Kairat)
Club Brugge (Rangers)
Copenhagen (Basel)
Red Star Belgrade (Pafos)
Fenerbahce (Benfica)
Winners from Europa League Play-Off Round
Young Boys (Slovan Bratislava)
Samsunspor (Panathinaikos)
Lech Poznan (Genk)
Aberdeen (FCSB)
Sigma Olomouc (Malmo)
Shkendija (Ludogorets)
Dynamo Kyiv (Maccabi Tel Aviv)
Rijeka (PAOK)
Brann Bergen (AEK Larnaca)
Lincoln Red Imps (Braga)
KuPS (Midtjylland)
Zrinjski (Utrecht)
Of course, it's quite likely some of those teams will either lose their CL play-off, or win their Europa League play-off and then the make up of the Pots will change.