2018 ScheduleAll times ET
Atalanta surged into contention for a top-four finish in Serie A with a 2-1 victory at Napoli on Monday.
Arsenal beat Napoli to book their second straight Europa League semifinals appearance, and will now take on Valencia for spot in the final.
Napoli postponed Juventus's march to the Serie A title and consigned Chievo to relegation with a 3-1 win at the Stadio Bentegodi on Sunday.
Arsenal have launched an investigation into a video which appears to show a supporter racially abusing Napoli defender Kalidou Koulibaly.
Serie A future and past helped Arsenal see off Italian opponents, but this Europa League quarterfinal's open first leg suggests the tie is not over.
Arsenal beat Napoli 2-0 in the first leg of their Europa League quarterfinal tie on Thursday.
Juventus were forced to put their Serie A title celebrations on hold after second-placed Napoli drew 1-1 at home to 10-man Genoa on Sunday.
Empoli stunned Napoli with a 2-1 home win on Wednesday to boost their survival hopes and leave the visitors 18 points adrift of Juventus.
Napoli ripped Roma's defence to shreds as they handed the hosts an embarrassing 4-1 defeat at the Stadio Olimpico on Sunday.
Napoli president Aurelio De Laurentiis hopes Carlo Ancelotti can become the club's Sir Alex Ferguson and said he has a job for life.
"Thank you from the bottom of my heart to everyone for your prayers and your thoughts," Ospina wrote on Twitter.
David Ospina suffered an injury on five minutes after clashing with Udinese winger Ignacio Pussetto but played on until he collapses on 42 minutes.
Arsenal have been handed a difficult draw against Serie A side Napoli in the quarterfinals of the Europa League.
Sarri had previously suggested his emotional connection to his former club would make him wary of facing them.