Mikel Arteta faces a defensive headache for the next six games with Rob Holding potentially set to miss all of them.The defender was replaced by David Luiz in the starting line-up for Saturday's 1-0 defeat to Manchester City, after suffering tightness in his hamstring during the warm-up.Before that Holding had been almost ever present in the Arsenal team, having started all but one of their previous games this season.Arteta is now sweating on the results of a scan on Holding's hamstring, with the Gunners fearing the centre-half could be out of action for three to four weeks, according to Mail Online.The worry is he could now miss Arsenal's Europa League opener away to Rapid Vienna on Thursday, as well as Premier League clashes against.
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