Emirates star out for three months.
Arsenal received further bad news with defender Bacary Sagna being ruled out for at least three months with a broken leg.
The French Football Federation confirmed the right-back fractured his fibula in yesterday’s north London derby defeat to Tottenham Hotspur.
The 27-year-old was taken to hospital after being carried off on a stretcher during the second half at White Hart Lane.
The FFF statement read: “The doctor of the France team, Fabrice Bryand, was informed by Arsenal of a fracture to the right fibula of Bacary Sagna.
“The player was hurt during the 2-1 defeat against Tottenham on Sunday. He will be operated on and is not expected to be available for three months.”
But Arsenal did not confirm the need for surgery, saying only that Sagna will see ankle specialists today to assess the extent of the fracture to his right leg.
“It is expected that Bacary will be out for approximately three months and a surgical procedure cannot be ruled out at this stage,” Arsenal said on its website.
Sagna was carried off the pitch on a stretcher after falling badly in the 68th minute following Benoit Assou-Ekotto’s challenge and was taken to hospital.
The 2-1 defeat exposed Arsenal’s defensive frailtiesagain as they were beaten for the fourth time in seven league games this season.
The loss of Sagna merely compounded their misery with the Gunners were already without Thomas Vermaelen, Johan Djourou, Sebastien Squillaci and Laurent Koscielny.
Without Sagna, manager Arsene Wenger will have to call upon the inexperienced Carl Jenkinson to fill-in at right-back.
Wenger all but conceded the title but dismissed the threat of relegation and has readjusted his sights on retaining Champions League football.
“At the moment, we have to set realistic targets and to get in touch with teams that fight to be in the Champions League positions.
“To say today ‘we will win the league’ is not realistic. But we have to fight to come back into a better position.
“We lack a little bit of confidence at the moment and just want to protect our result too much when we have one.”