In memory of Emiliano Sala, a minute's silence will be observed at all Champions League and Europa League games this week, UEFA said on Tuesday.
Portuguese trio Porto, Benfica and Braga reached the Europa League semi-finals in contrasting styles as Europe's second-string club competition produced another goal feast on Thursday.
Barcelona made a disappointing start to their Champions League campaign by losing 2-1 to AS Monaco on Thursday.
After a collective blow-out in the Champions League, England has a three-pronged attack on Europe's second tier competition with Chelsea, Tottenham Hotspur and Newcastle United all vying for Europa League success.
Financially troubled Spanish club Real Mallorca have been excluded from this season's European competition by governing body UEFA.
IMAGES from the Europa League matches played on Thursday
On Sunday, after Liverpool's final game of the season, a 2-0 home win over Wolverhampton Wanderers, Klopp led the Anfield crowd in a song for the incoming manager.
Tottenham Hotspur's Europa League hopes were crushed by mid-table Belgian side Gent, who booked their spot in the last 16 with a 2-2 draw at Wembley on Thursday as the hosts paid the penalty for Dele Alli's first-half red card.
Liverpool striker Dirk Kuyt headed a late goal to send the five-times European champions into the last 16 of the Europa League with a 1-0 victory over a defiant Sparta Prague at Anfield on Thursday.
Arsene Wenger praised his Arsenal players for the 'resilient and disciplined' way in which they qualified for the Europa League quarter-finals with a 3-1 win over AC Milan on Thursday.
VfB Stuttgart had to come from two goals down against Norwegian outsiders Molde on Thursday to scrape into the final qualifying round of the Europa League.
Paraguay striker Oscar Cardozo's well-taken double fired Benfica into a Europa League final with Chelsea after they beat Fenerbahce 3-1 in Lisbon to win their semi-final 3-2 on aggregate.
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.
Napoli recovered from three goals down to draw 3-3 at Steaua Bucharest in the Europa League on Thursday as holders Atletico Madrid were held 1-1 by Bayer Leverkusen.
Images from the Europa League matches played across Europe on Thursday.
Inter Milan and Bayer Leverkusen cruised into the Europa League knockout stage with emphatic wins on Thursday but holders Atletico Madrid and former winners Liverpool suffered surprise defeats.
Liverpool diced with elimination before scoring two late goals to win 2-1 at Trabzonspor and squeeze into the Europa League on Thursday while Swiss second division side Lausanne came through with a shock win over Lokomotiv Moscow.
Fellow Serie A sides Atalanta and Lazio also won while Portugal's Vitoria Guimaraes began their match against Salzburg with not a single European player in the team.
Bayer Leverkusen crushed hosts VfL Bochum 5-0 to stretch their remarkable unbeaten run across all competitions this season to 50 consecutive matches.
Diego Forlan scrambled an early goal to give Atletico Madrid a deserved 1-0 win over a lethargic-looking Liverpool in the first leg of their Europa League semi-final on Thursday.
Juergen Klopp, who has breathed new life into Liverpool in his seven months in charge, would seal his place in the hearts of the club's supporters if he pulls off victory over Sevilla in Wednesday's Europa League final.
Liverpool full back Nathaniel Clyne is eager to end Manchester United's Europa League campaign after losing both Premier League matches against their arch rivals for a second successive season. English football's most successful clubs meet for the first time in Europe on Thursday in the first leg of their last-16 clash at Anfield, with Liverpool aiming for revenge after a 1-0 home loss in January and 3-1 defeat at Old Trafford in September. "I think we owe them from the Premier League games, which we probably should have got more out of. But we have time now to put things right and progress through the cup," Clyne told British media.
Romanians Astra handed West Ham United their first competitive defeat at the London Stadium as Slaven Bilic's team were beaten in the Europa League playoffs on Thursday.
Burnley reached the Europa League third qualifying round with a 3-1 win over Aberdeen after extra time at Turf Moor on Thursday but now face another tough battle to increase their squad size.
Manchester United and Liverpool, English football's two most decorated clubs, were drawn together in the last 16 of the Europa League on Friday.
Tottenham Hotspur could face punishment from European soccer's governing body UEFA after their Europa League game with Partizan Belgrade on Thursday was suspended for several minutes following three separate pitch invasions.
Bayer Leverkusen beat Freiburg 3-2 to edge closer to a first ever Bundesliga title.
Two goals from Luis Diaz and one from Mohamed Salah helped Liverpool stroll to a 3-0 victory at Manchester United.
Unai Emery's side were heading for a demoralising defeat, three days after losing meekly to Sheffield United in the Premier League, but substitute Pepe's late intervention kept the Gunners top of Group F with a maximum nine points.
The Manchester clubs' wretched continental seasons ended on Thursday as outclassed United and battling City suffered contrasting Europa League last-16 exits to an exhilarating Athletic Bilbao and a fortunate Sporting respectively.
Tributes pour in for Russian Opposition leader Alexei Navalny, who died mysteriously in a Russian prison on Friday.
Atletico Madrid and Athletic Bilbao should serve up a Europa League final to remember on Wednesday and remind the continent that Spain is not just about Real Madrid or Barcelona.
Three time European champions Inter Milan were stunned 2-0 at home by Israeli side Hapoel Beer-Sheva and Manchester United were floored by a late goal from Feyenoord as the Europa League group stage got underway on Thursday.
Sevilla, winners of the Europa League for the past two years, will play Shakhtar Donetsk in this season's semi-final.
Liverpool twice squandered the lead, trailed 3-2 and then scored three times in the last 25 minutes to win 5-3 at Young Boys in an enthralling but blunder-prone Europa League tie on Thursday.
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.
Javier Saviola and Oscar Cardozo scored two goals apiece and defender Luisao was also on target as Benfica thumped Everton 5-0 in the Europa League on Thursday.
Napoli went down 3-1 at home to RB Leipzig, Arsenal and AC Milan enjoyed comfortable away wins, and Borussia Dortmund's Michy Batshuayi scored twice to secure a 3-2 victory in Europa League last 32, first leg action
Former European champions Ajax Amsterdam and Celtic, who both suffered the indignity of being knocked of the Champions League qualifiers by underdogs this season, will meet in the Europa Leagueafter being drawn together in the group stage on Friday.
Carlos Bacca claimed the plaudits with a superb double strike, including a late winner to decide a pulsating clash that began at a hair-raising pace with four goals in the first half.
