A round-up of Tuesday's action in the UEFA Champions League.
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.
Images from the UEFA Champions League matches played across Europe on Wednesday
Ajax, semi-finalists last season, came from behind to beat PAOK 3-2 for a 5-4 aggregate win over the Greeks while Red Star knocked out FC Copenhagen on penalties after a bizarre shootout involving 22 spot-kicks.
Arsenal suffered a shock Europa League exit to Olympiakos Piraeus on away goals after a 2-1 extra-time home defeat, while Manchester United and Wolverhampton Wanderers cruised into the last 16 with emphatic aggregate wins on Thursday.
Barcelona were held 1-1 at home by Napoli in the first leg of their Europa League knockout stage playoff
If two or more clubs are level on points at the end of the group stage, a number of criteria will be taken into consideration to decide the qualifiers for the next round, starting with the head-to-head record among the teams in question. It then goes to superior goal difference and then goals scored in those matches.
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Thirteen teams have now qualified for the last 32 including Bayer Leverkusen, FC Zurich and Lazio who had already secured places in the next stage of the competition.
Yet Milan's defensive frailty was punished when Konstantinos Fortounis scored from the penalty spot in the 81st minute to give his side the win that left them second in Group F on 10 points.
Celtic, who won Europe's premier club competition in 1967, set up a clash with Romanians Cluj in the next stage after a 2-0 win at Nomme Kalju completed a 7-0 aggregate rout of the Estonian champions.
IMAGES from Europa League matches played on Thursday.
Ajax Amsterdam, returning to the stadium where they last won the Champions League 20 years ago, squandered a two-goal lead to draw 2-2 against 10-man Rapid Vienna on Wednesday.
Arsenal teenager Bukayo Saka scored his first goal for the club as they beat 10-man Eintracht Frankfurt 3-0, while Manchester United's 17-year-old Mason Greenwood secured a 1-0 win over FC Astana as the Europa League group stage began on Thursday.
Barcelona battled back from a goal down and scored twice in the second half to overcome hosts Borussia Moenchengladbach 2-1 in their Champions League Group C match on Wednesday despite the absence of the injured Lionel Messi.
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Manchester United are almost certain to reach the knockout stage of the Champions League after they beat Benfica 2-0 at Old Trafford on Tuesday to make it a perfect four wins in Group A.
AS Roma suffered another European humiliation on Tuesday when they had two players sent off, lost 3-0 at home to Porto and missed out on the Champions League group stage.
Former European champions Red Star Belgrade, Ajax Amsterdam and Celtic all made it comfortably through to the third qualifying round of the Champions League on Wednesday after surviving away legs.
Harry Kane netted his 200th goal for Tottenham Hotspur as they won 3-1 at Ludogorets and AC Milan's 24-match unbeaten run ended
'Barca are the best team around and when we play as we know how we are unstoppable'
On a good night for English clubs in the Europa League, Manchester United hammered AZ Alkmaar 4-0, while Wolverhampton Wanderers also thrashed Besiktas 4-0 in Group K, and Arsenal came from two goals down to draw 2-2 away to Standard Liege and finish first in their pool. The upset of the night came in Group J as Crivelli scored a 90th-minute winner against Borussia Moenchengladbach to send Basaksehir through and knock the Germans out, with AS Roma grabbing the runner-up spot thanks to a 2-2 home draw with Wolfsberger as the Europa League group stage concluded on Thursday.
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Atletico Madrid have signed striker Luis Suarez from Barcelona, the Spanish clubs said on Wednesday, bringing to an end his six-year stint at the Camp Nou.
New Liverpool boss Juergen Klopp made it three wins from his last three matches with a 1-0 success at Rubin Kazan in Russia that left them second in Group B, two points behind Swiss club Sion on Thursday.
Jonatan Soriano's love affair with the Europa League continued as last season's top scorer grabbed a hat-trick on Thursday to help Salzburg become one of four teams to reach the knockout stages.
Seven-times champions AC Milan, knocked out of the Champions League by Barcelona in the last two seasons, were drawn against the Catalans again in the group stage of this season's competition on Friday.
Chelsea's Ruben Loftus-Cheek had a Europa League night to remember by scoring the first hat-trick of his career as the midfielder inspired them to a 3-1 home win over Belarus champions BATE Borisov on Thursday.
Azeri champions Qarabag took a big step towards the playoff round with a 2-1 win at Cypriot side APOEL but Dinamo Zagreb left their progress hanging in the balance after the Croats played out a 1-1 home draw against Hungary's Ferencvaros.
Robert Lewandowski scored a brilliant free kick to give Bayern Munich a 1-0 win over Atletico Madrid in their last Champions League Group D outing on Tuesday, ending the 100 percent record of their opponents. The Poland international curled the ball over the wall and into the corner of the net in the 28th minute but the goal had no impact on the final standings with Atletico guaranteed top spot and Bayern in second place.
News of all that's transpired on and off the football field
Belgian league leaders Antwerp secured a shock 1-0 win over Tottenham Hotspur and AC Milan extended their unbeaten run to 23 games as they won 3-0 against Sparta Prague in the Europa League on Thursday, while Arsenal cruised to a 3-0 win over Dundalk.
Arsenal and Chelsea were among seven teams to reach the Europa League knockout stage on Thursday, while last year's runners-up Olympique de Marseille were eliminated at the group phase.
Sofiane Feghouli's late goal eased the nerves at Valencia's Mestalla as the Spanish club grabbed a 3-1 victory over Monaco in the first leg of their Champions league play-off round tie on Wednesday.
Arsenal had scored 10 goals in two matches against BATE Borisov in the same competition in 2017 but never looked like being as prolific in the freezing temperatures of Belarus.
Manchester United were given a troublesome tie against Club Bruges in the draw for the Champions League playoff round on Friday, although it could have been worse as they avoided Lazio, CSKA Moscow or Monaco.
Rediff.com brings a preview of the main matches coming up this weekend in the English Premier League.
Barcelona's 2-1 loss at Ajax Amsterdam in the Champions League last week was down to a lack of intensity while Sunday's 1-0 reverse at Athletic Bilbao in La Liga exposed their relative physical frailty.
Mesut Ozil guided Arsenal to a 2-0 victory over Napoli while a late Cesc Fabregas header gave Barcelona a laboured 1-0 win at 10-man Celtic in the Champions League on Tuesday.
Manchester United defender Cameron Borthwick-Jackson has joined Wolves on a season-long loan, the Premier League club confirmed on Twitter.