These are the 32 teams still in the Europa League. Lots of decent teams in there I think, but none that I look at instantly think "no way could we beat them" - although my knowledge of a lot of those teams isn't exactly red hot!
I think we could probably beat most of those teams on our day though, but some would probably be an upset for us to win. But what makes it hard with the Europa is that we'd need to beat them over 2 legs, and it's not only a question of can we beat one of those good teams, but you need to beat several of them to get to the final.
What that list of winners does show is that while there is a lot of dross in the Europa League, the ones who win are strong sides.
Wolfsberg (AUT) vs Tottenham (ENG)
Dynamo Kyiv (UKR)* vs Club Brugge (BEL*)
Real Sociedad (ESP) vs Manchester United (ENG*)
Benfica (POR) vs Arsenal (ENG)
Crvena zvezda (SRB) vs AC Milan (ITA)
Antwerp (BEL) vs Rangers (SCO)
Slavia Praha (CZE) vs Leicester (ENG)
Salzburg (AUT)* vs Villarreal (ESP)
Braga (POR) vs Roma (ITA)
Krasnodar (RUS)* vs Dinamo Zagreb (CRO)
Young Boys (SUI) vs Leverkusen (GER)
Molde (NOR) vs Hoffenheim (GER)
Granada (ESP) vs Napoli (ITA)
Maccabi Tel-Aviv (ISR) vs Shakhtar Donetsk (UKR*)
LOSC Lille (FRA) vs Ajax (NED*)
Olympiacos (GRE)* vs PSV Eindhoven (NED)
Bringing it back to Brighton (since this is the pre-match thread for the FA Cup game after all), it does show that if we want to progress in the EL it's going to take our strongest team being on their game, so it means we can't put out our first team or even close to it in the FA Cup.