Images from Europa League matches played on Thursday.
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.
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.
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.
Manchester City striker Gabriel Jesus failed to find the net in over 700 minutes on the pitch in a run of 10 games between October and November for club and country, as City struggled to keep pace in the Premier League title race and dropped to third. Jesus is City's second-choice striker behind Sergio Aguero and he had admitted to being frustrated earlier this season when Pep Guardiola benched him in favour of the Argentine.
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.
Visitors Ajax had looked comfortable after former Southampton winger Tadic set up the first goal with a swerving cross before drilling home the second himself.
A round-up of Tuesday's action in the UEFA Champions League.
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.
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.
IMAGES from Europa League matches played on Thursday.
Manchester City have one just victory from their last 10 games across all competitions.
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.
AC Milan grabbed a 1-1 draw at Manchester United in the blockbuster Europa League last-16 first-leg at Old Trafford on Thursday.
Pep Guardiola will return to the Nou Camp in the Champions League group stage after his new club Manchester City were drawn against his former Barcelona team on Thursday. The two sides were drawn in Group C alongside Borussia Moenchengladbach and former European champions Celtic in one of the toughest of the eight sections. Spanish coach Guardiola, who won the Champions League twice with Barca, faced the Catalans when he was in charge of Bayern Munich two seasons ago and suffered a 5-3 defeat in the semi-finals.
Manchester City squandered a three-goal lead to draw 3-3 with Feyenoord in the Champions League on Tuesday.
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.
Images from the UEFA Champions League matches played on Tuesday.
Barcelona are in the middle of an injury crisis as they head to Valencia for Saturday's La Liga game looking to keep up with pacemaking pair Atletico Madrid and Real Madrid. Without injured goalkeeper Jasper Cillessen and right back Sergi Roberto for the last two games, Barca will also be missing defenders Jordi Alba and Gerard Pique after both were hurt in Wednesday's 4-0 win over Manchester City in the Champions League. Pique sprained his right ankle while Alba injured his left hamstring and both are out until November.
Tottenham said former midfielder Ryan Mason will be in charge of the first team on Monday.
Images from Champions League matches played across Europe on Tuesday
"I've had a bit more luck than in recent weeks, so I'm making the most of it. For a striker, it always works in cycles and I know that. You can't start doubting yourself," Giroud told reporters after the game.
Levski Sofia fans force players to remove shirts after derby defeat
Barcelona were held 1-1 at home by Napoli in the first leg of their Europa League knockout stage playoff
A round-up of Tuesday's action in the UEFA Champions League.
Having seen the domestic league and cup double go to Porto last term, Benfica missed a string of chances against PAOK in a one-sided first half as they enjoyed 72% of possession.
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.
Olympique de Marseille were the fall guys on a hectic opening night of Europa League group stage action as German club Eintracht Frankfurt returned from the south of France with a surprise 2-1 victory on Thursday.
Napoli kept alive their hopes of advancing from Group C after Lorenzo Insigne, Victor Osimhen and Matteo Politano secured a 3-0 home win over Legia Warsaw.
CSKA Moscow must close part of their stadium for their next Champions League home game following the racist abuse hurled at ManchesterCity's Yaya Toure by the Russian club's fans last week, UEFA said on Wednesday.
"Tomorrow we don't play six points against zero. We play at 7.45, at 0-0 with 90 minutes to go," he said.
Jose Mourinho was delighted that Chelsea made a winning start to their Champions League campaign on Wednesday, but said he was not happy that Manchester United, Manchester City and Arsenal had all lost their opening matches.
Jose Mourinho's Chelsea turned from domestic whipping boys back to European stalwarts on Wednesday, beating his former club Porto 2-0 to top Champions League Group G.
Bayern Munich are confident they have overcome a mini-slump just in time for their Champions League round of 16 second leg against Juventus on Wednesday as they chase a treble of titles this season.
Arsenal defender Laurent Koscielny has been 'deeply affected' by last week's Paris attacks and might not be in the right frame of mind to play in Saturday's Premier League game against West Bromwich Albion, manager Arsene Wenger has said.
Manchester United and Tottenham Hotspur built hefty leads with emphatic away wins in their Europa League last 32 first-leg matches but AC Milan were held to a 2-2 draw at Red Star Belgrade as the competition resumed on Thursday.
IMAGES from Europa League matches played on Thursday.
IMAGES from the Europa League matches played on Thursday
Former European champions Celtic were helped by two own goals as they thumped Astana 5-0 at home and a late goal from Wissam Ben Yedder gave Sevilla a 2-1 win at Istanbul Basaksehir in torrential rain.
IMAGES from Europa League matches played on Thursday.