If the Premiership champions avoid defeat on Saturday against Leicester City they would become only the second team in history to complete an unbeaten top-flight season.
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.
IMAGES from Saturday's English Premier League matches.
Wayne Rooney scored two spectacular goals as holders Manchester United reached the FA Cup fifth round with a classy 3-0 win over Middlesbrough.
The 41-year-old has made 640 appearances in Serie A, within striking distance of the 647-game record of AC Milan defender Paolo Maldini. Buffon began his career at Parma before moving to the Turin club in 2001.
The only speculation around Old Trafford these days as one of the world's great clubs continue their laborious struggle to rediscover the halcyon days of the Alex Ferguson era seems to be not if, but when this dream alliance will end in divorce.
Manchester City stumbled to the most unexpected defeat of the Premier League season on Saturday before neighbours Manchester United began their brave new world under Ole Gunnar Solskjaer with a glorious reminder of long-forgotten attacking swagger.
Images from the League Cup matches played on Tuesday
Liverpool surrendered a two-goal lead as they were held to a 2-2 draw by third-tier Shrewsbury Town in the FA Cup fourth round on Sunday after second-half substitute Jason Cummins struck twice to inject some much-needed late magic into the competition. Earlier, Harry Maguire's thunderbolt for Manchester United started a goal rush at Tranmere where the Reds scored five times before halftime. Diogo Dalot, Jesse Lingard, Phil Jones, Anthony Martial and Mason Greenwood also scored.
He has been appointed a member of the Science and Technology Select Committee of the House of Lords.
Spaniard Herrera finished off a fine move with a precise header from Pogba's cross just past the half-hour and United's French midfielder scored himself when he nodded powerfully home from a Marcus Rashford delivery before the break.
The English fan was stabbed and killed when he chased a pickpocket.
Former England boss Glenn Hoddle has been appointed manager of Wolverhampton Wanderers, the second division club said.
City's Aguero doubtful starter for Watford trip
Relegation will all-but become reality for Wolverhampton Wanderers if they lose at home to Middlesbrough on Saturday.
Hasselbaink came on to score three times in the last 15 minutes in a 5-2 rout over Wolverhampton Wanderers.\n\n
Reigning champions Manchester City took the lead after 24 seconds but suffered a shock 2-1 defeat at Newcastle United.
In a stunning result at the Molineux, the wooden spoonists played above themselves to defeat what is rated as one of the world's great football clubs.
'So, the Champions League final will be played between two teams who just don't know when they are beaten,' says Suhit K Sen.
The defeat was especially costly for Claudio Ranieri's expensively assembled team who began the day in joint second place with title rivals Arsenal.
Arsenal thrashed Wolverhampton Wanderers 5-1, while Southampton beat Portsmouth 2-0 to make the quarter-finals of the English League Cup.
Chelsea closed the gap on leaders Arsenal to four points on Saturday with a 1-0 win at Tottenham Hotspur in the English premier league.
Mourinho's tinkerings meant a first start of the season for midfielder Scott McTominay, playing on the right of a three-man defence, while Anthony Martial played instead of the dropped Alexis Sanchez. On this evidence, more changes may be needed when United take on Valencia in the Champions League on Tuesday.
Lucas ended a goal drought stretching back to 2010 and Divock Origi missed a late penalty as Liverpool beat fourth tier Plymouth Argyle 1-0 in an FA Cup third-round replay on Wednesday.
Manchester City endured some anxious moments but escaped from fourth-tier Newport County with their FA Cup hopes intact as Phil Foden scored twice in an ultimately comfortable 4-1 fifth-round victory on Saturday.
Images from the English Premier League matches played on Saturday.
Having enjoyed plenty of success at Old Trafford as Alex Ferguson's trusted right-hand man, the chance to return after a six year absence was not an opportunity the 56-year-old was going to let pass.
Of the 32 teams that have been promoted to the premier league since its inception in 1992, 14 have gone straight back down the next season.
Manchester City claimed the win required to finally end Liverpool's relentless attempt to dethrone them as Premier League champions as they hit back from a goal down to crush Brighton and Hove Albion on the south coast on Sunday.
The pain of missing out on a first domestic league crown for 29 years will be eased by the knowledge that European glory could be on the horizon for Liverpool
A rejuvenated Manchester United claimed a sixth win from six matches since former striker Ole Gunnar Solskjaer stepped in following the sacking of Jose Mourinho.
Chelsea manager Antonio Conte was fuming at the final whistle after Pedro and Alvaro Morata were dismissed in extra time and two penalty appeals had been waved away, but the Premier League champions regained their composure to win the shootout 5-3.
News of all that's transpired on and off the football field.
News of all that's transpired on and off the football field
Manchester City suffered their first home Premier League loss in eight months as a shock 3-2 defeat by Crystal Palace on Saturday left Pep Guardiola's champions trailing leaders Liverpool by four points.
Manchester City's stellar season gathered yet more momentum as the runaway English Premier League leaders reached the League Cup semi-finals with a penalty shootout victory at Leicester City.