Barcelona boss Luis Enrique has rejected claims Gerard Pique picked up a deliberate booking at the Emirates forcing him to miss the second leg at the Nou Camp.
The centre-back cynically fouled Danny Welbeck late on, earning him a caution and a suspension but Enrique has defended Pique.
It wasn't deliberate. Gerard Pique, if you saw the fault (foul), he had to do it, it wasn't deliberate at all.
Everyone who knows about football knows you need a first half like this in order to have a second like the one we had. Arsenal are very good at helping each other collectively and we needed a lot of possession of the ball.
My players individually performed perfectly. But there is nothing decided yet, we will have to perform very well in the (second leg).
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Arsenal will recall their big-hitters for Tuesday night's Champions League first knock-out round tie against holders Barcelona.
Gunners boss Arsene Wenger rested a number of his key men for the FA Cup fifth-round draw with Hull on Saturday with the first-leg against the Catalan outfit in mind.
But, while the likes of Mesut Ozil, Aaron Ramsey and Petr Cech will return to the squad, Jack Wilshere (leg), Gabriel (hamstring), Santi Cazorla (knee) and Tomas Rosicky (thigh) are all still missing.
Provisional squad: Cech, Ospina, Monreal, Gibbs, Koscielny, Gabriel, Mertesacker, Bellerin, Chambers, Ramsey, Elneny, Coquelin, Flamini, Ozil, Oxlade-Chamberlain, Reine-Adelaide, Iwobi, Sanchez, Campbell, Walcott, Welbeck, Giroud.
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Lionel Messi has been named Spain's La Liga player of the month for January - the first time he has ever won the award.
La Liga player of the month has been given out since the beginning of the 2013-14 Primera Division season, but the five-time FIFA Ballon d'Or winner had not won it until now.
The five-time Ballon d'Or winner finally won the award at the 23rd time of asking after scoring six goals in as many league games in January.
The 28-year-old struck a hat-trick against Granada as well as scoring in victories over Athletic Bilbao, Malaga and Atletico Madrid to take his total of league goals for the season to 12.
Messi is only the second Barcelona player to win the award following Neymar's success in November.
Cristiano Ronaldo has won the award twice since it began in September 2013.
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Reports in Portugal claim that Manchester United have agreed to hand Jose Mourinho the manager's job, and they want him to sign Barcelona superstar Neymar in the summer.
The Old Trafford board see Mourinho's appointment, together with a world record bid for Neymar as the best response to Pep Guardiola's imminent arrival at Manchester City.
According to O Record, United's directors believe that communication will be a critical factor in the Old Trafford dressing room, which is why they've chosen Mourinho ahead of Diego Simeone or Antonio Conte, since he has a much better grasp of the English language.
Mourinho is also fluent in Portuguese and it's felt he would be the most suitable candidate to persuade Portuguese-speaking Neymar into leaving Barcelona for the Red Devils.
The 24 year-old's father has also confirmed that United are willing to meet his buyout clause at Barcelona, and he has been quoted in the Portuguese media this week saying:
"Manchester United is the side that offered €190m (£144m) for Neymar. He has still two years left on his contract but you all can be calm as my son is so happy here."
Luis Suarez and Lionel Messi both scored hat-tricks as Barcelona put one foot into their second successive cup final after a 7-0 rout.Read the full story ›
Goals from Lionel Messi and Luis Suarez fired Barcelona to a priceless 2-1 win over nine-man Atletico Madrid to strike a huge blow in the Primera Division title race.
Atletico got off to a fine start at the Nou Camp as Koke gave them the lead after just 10 minutes but Messi and Suarez each struck in the space of eight minutes to turn the game around before the break.
The balance of the table-top showdown then further tipped in Barca's favour when Atletico defenders Filipe Luis and Diego Godin were sent off, and a frustrating afternoon for Diego Simeone's side was later compounded as Augusto Fernandez was stretchered off with a suspected knee injury.
The result sees the Catalan side move three points above their nearest challengers at the top of the table thanks to their fifth straight win over Atletico, and Luis Enrique's men still boast a game in hand.