Holders Sevilla will take on Fiorentina for a place in this season's Europa League final.
Zenit St Petersburg and Fiorentina are among the sides aiming to book their place in the UEFA Europa League semi-finals.
Fiorentina's slim Champions League hopes were all but extinguished by a 1-0 defeat to Hellas Verona.
Marek Hamsik scored twice as Napoli took a giant step towards the Europa League semi-finals by beating Wolfsburg 4-1 away.
Napoli shrugged off the disappointment of a disallowed ghost goal to push on and beat Fiorentina 3-0.
Fiorentina forward Giuseppe Rossi will not hurry his return to action as he recovers from his latest injury.
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