Robin van Persie's hat-trick lifted the gloom surrounding Manchester United and manager David Moyes as the English side beat Olympiakos Piraeus 3-0 to overturn a 2-0 first-leg deficit and reach the Champions League quarter-finals on Wednesday.
Napoli begin their title defence at Sassuolo on Saturday.
Manchester United breezed into the next round with a 6-1 aggregate win over Club Brugge
A rare headed goal from Rivaldo earned Olympiakos Piraeus a 1-0 win over Akratitos in the Greek first division.
Ricardo Quaresma scored a stoppage-time goal to give Porto a 1-0 victory over Besiktas.
Arsenal have left six first-team regulars in London ahead of their final Champions League group stage match against Olympiakos Piraeus in a bid to avoid fatigue following the home defeat to Swansea City.
Images from the Champions League matches played across Europe on Wednesday.
Olympiakos Piraeus may never have a better chance to overcome their Manchester United hoodoo than in Tuesday's first leg of their last-16 Champions League tie.
Girondins Bordeaux are on course to reach the Champions League quarter-finals for the first time after Michael Ciani's first-half header earned Laurent Blanc's side a 1-0 victory at Olympiakos Piraeus on Tuesday.
Greek Super League leaders Olympiakos Piraeus set a club record 17 successive league wins by beating Levadiakos 3-1 at the Georgios Karaiskakis stadium on Sunday.
Real Madrid's Cristiano Ronaldo set a Champions League group phase scoring record on Tuesday as Bayer Leverkusen and Olympiakos Piraeus reached the last 16 and snow forced Galatasaray's match with Juventus to be abandoned.
The Journalists Newspaper reported that the Greek champions' place in Europe's elite competition would be at risk if corruption claims against club president Marinakis were proven.
Manchester United's dwindling hopes of lifting a trophy this season are dangling by a thread after they produced an abject display to lose 2-0 at Olympiakos Piraeus in a Champions League last-16 first leg on Tuesday.
Olympiakos Piraeus secured a surprise 3-2 victory over last year's Champions League runners-up Atletico Madrid to make a dream start to their Group A campaign on Tuesday.
Arsenal will put one of the best Champions League records on the line when they face Olympiakos Piraeus in a showdown for second spot in Group F on Wednesday.
In the other pairings, English champions Manchester United will take on Greek club Olympiakos, while AC Milan take on Atletico Madrid.
Juventus did the bare minimum as they scraped into the Champions League knockout stage on Tuesday with a 0-0 draw at home to Atletico Madrid, a result which also suited the Spaniards who topped the group.
Manchester United's hat-trick hero Robin van Persie was carried off on a stretcher in the final minutes of their Champions League second leg against Olympiacos.
A rousing 2-1 La Liga victory at Real Madrid on Saturday may suggest otherwise, but Atletico Madrid are still rebuilding after losing several key players in the close season, coach Diego Simeone said on Monday.
Olympiakos Piraeus battled back from a two-goal deficit to earn a 2-2 home draw with last year's runners-up Tottenham Hotspur in their Champions League Group B opener.
Manchester United kept their season alive by reaching the Champions League quarter-finals with a memorable victory over Olympiakos Piraeus on Wednesday, but under-pressure manager David Moyes was not getting too carried away.
The former Brazil international pulled a groin muscle in Sunday's 2-1 home defeat by PAOK Salonika.
Manchester United striker Robin van Persie will be sidelined for up to six weeks after spraining his knee in the midweek Champions League win over Olympiakos Piraeus, the club said on Friday.
Arsenal defender Andre Santos will undergo ankle surgery this week and is expected to be sidelined for around three months, the Premier League club said on Monday.
It was an epic night of high drama, and Robin van Persie was at his lethal best. The Dutch striker came up with a stunning hat-trick to lift the pressure on David Moyes and gloom surrounding Manchester United.
Holders Real Madrid will start their attempt to win a record third straight Champions League title in a group with Borussia Dortmund, Tottenham Hotspur and Apoel Nicosia after Thursday's draw.
Valencia have agreed to appoint Ernesto Valverde to replace Mauricio Pellegrino as their new coach until the end of the season, the Spanish club said on Monday.
Panathinaikos won the Greek title for the first time in six years by beating Iraklis 2-0 on Sunday.
Arsenal, VfB Stuttgart and Olympiakos Piraeus all scored 2-0 away wins in their final Champions League playoff matches on Tuesday to take a big stride towards the group stage before next week's second legs.
Primera Liga champions and leaders Real are at home to Greek title-holders Olympiakos Piraeus while injury-hit Barcelona are away to Rangers in this week's Champions League fixtures.
Twice UEFA Cup winners Sevilla failed to reach the knockout phase after a 1-0 defeat at Sampdoria eliminated the Spaniards. Sampdoria's victory sent them through from Group C along with VfB Stuttgart, who thumped Standard Liege 3-0 to progress to Friday's last 32 draw. Paris St Germain, twice winners Tottenham Hotspur, NEC Nijmegen and Olympiakos Piraeus also sealed places in the first knockout round.
Girondins Bordeaux survived a second-half scare to grab a 2-1 win over Olympiakos Piraeus on Wednesday and give France a second team in the Champions League quarter-finals.
Holders Barcelona booked a Champions League last 16 berth with a 2-1 win at Dynamo Kiev on Wednesday and were joined by Group F rivals Inter Milan, who sealed their passage with a 2-0 home defeat of Rubin Kazan.
Olympiakos have sacked their Brazilian coach Zico following a string of poor results, the Greek club confirmed on Tuesday.
European champions Real Madrid will face former champions Liverpool, FC Basel and debutants Ludogorets of Bulgaria following the draw for the group stage of the Champions league on Thursday.