Teams left:
Seeded
AZ Alkmaar, FC Basel 1893*, SL Benfica*, Eintracht Frankfurt, ACF Fiorentina, KRC Genk, PFC Ludogorets Razgrad, Olympique Lyonnais, SSC Napoli*, FC Rubin Kazan, FC Salzburg, Sevilla FC, FC Shakhtar Donetsk*, Tottenham Hotspur FC, Trabzonspor AŞ, Valencia CF.
Unseeded
AFC Ajax*, FC Anji Makhachkala, Real Betis Balompié, FC Chornomorets Odesa, FC Dnipro Dnipropetrovsk, FC Dynamo Kyiv, Esbjerg fB, Juventus*, SS Lazio, Maccabi Tel-Aviv FC, NK Maribor, PAOK FC, FC Porto*, FC Slovan Liberec, Swansea City AFC, FC Viktoria Plzeň*.
I think Lazio would need to face Genk to have a decent chance of progressing. Napoli and the Viola would want to avoid Ajax, Porto, or a trip to Russia/Ukraine, but in reality I say that both should have a decent chance of beating any of those teams. Juve on paper are the best team left in the compeition along with Spurs. It'd be embarrassing if they didn't win or come very close.