Team news 
Midfielder Alex Oxlade-Chamberlain faces up to a month out with a hamstring injury.
Midfielder Mathieu Flamini is back in contention for Saturday's Barclays Premier League match against West Ham after a hamstring problem.
Club captain Mikel Arteta (ankle) is set to step up his rehabilitation, as is defender Gabriel (hamstring), but Jack Wilshere (ankle) is still a few weeks away from a return.

West Ham 
West Ham are without James Tomkins for their trip to London rivals Arsenal on Saturday after the defender dislocated his shoulder in training.
The Hammers could also be without three of their first-team strikers. Carlton Cole (hamstring) and Andy Carroll (knee) are definite absentees whilst Enner Valencia is struggling to be fit having suffered a severe cut to his toe after standing on a broken teacup.
Winston Reid will miss out with a hamstring complaint, on-loan Carl Jenkinson cannot feature against his parent club and Alex Song (knee) could also be sidelined - although fellow midfielder Morgan Amalfitano is back having served a three-match ban. Sixteen-year-old defender Reece Oxford could be included in the squad as cover.
Key match stats (supplied by Opta)
Theo Walcott has scored five goals and set up three more in his last four Barclays Premier League games against West Ham
West Ham have won none of the last 13 Barclays Premier League games against Arsenal (W0 D2 L11), losing the last eight in a row.
Olivier Giroud has scored four goals in his four Premier League appearances against West Ham.
The Hammers have scored the first goal in four of the last five Premier League meetings with Arsenal, but the Gunners have come back to win on each occasion.
Arsenal are unbeaten in their last 12 Premier League London derbies at the Emirates, but West Ham were the first team ever to beat Arsenal at their new stadium back in April 2007.
The Hammers have won just one of their last seven Premier League London derbies away from home.
Sam Allardyce has never coached a winning team away at Arsenal in the Premier League, losing seven and drawing three of his 10.
Arsenal have won seven consecutive home league games; they have not won eight in a row since November 2005 (13).
Olivier Giroud has scored eight goals in his last 10 Premier League starts.
West Ham (15) have scored the most headed goals in the Premier League, while only two teams (Burnley 17 & Stoke 11) have conceded more than Arsenal (10, same as QPR).