Holders Sevilla will take on Fiorentina for a place in this season's Europa League final.
Holders Sevilla sealed their place in the Europa League semi-finals after a dramatic 4-3 aggregate win over Zenit.
Tottenham boss Mauricio Pochettino says the Europa League has not helped their Champions League aspirations.
Zenit St Petersburg and Fiorentina are among the sides aiming to book their place in the UEFA Europa League semi-finals.
Marek Hamsik scored twice as Napoli took a giant step towards the Europa League semi-finals by beating Wolfsburg 4-1 away.