Arsenal suffered a double injury blow ahead of the weekend trip to Swansea and Bayern Munich in the Champions League next week.
Against Sheffield Wednesday in the Capital One Cup, the Gunners lost Alex Oxlade-Chamberlain inside five minutes through injury, with Theo Walcott coming on but the replacement lasted little longer as he went off with what looked like his own muscle injury on 18 minutes.
Young Ismael Bennacer replaced Walcott to make his debut for the club.