The Gunners were already without goalkeeper Manuel Almunia and defenders Williams Gallas, Johan Djourou and Gael Clichy for Wednesday night's Champions League quarter-final second leg with Villarreal at the Emirates Stadium.
But now both full-backs from that encounter, Sagna and Gibbs, could now miss the weekend clash with Guus Hiddink's men due to illness and a groin problem respectively.
“We still have Sagna as a doubt from the weekend, and after last night we have Kieran Gibbs as a doubt too. He has a little groin problem," manager Arsene Wenger told the club's official website.
“There is the option to play Sagna in there if he has recovered. The other is to play Silvestre in there and put Song at the back.
“There's not many other options but we'll deal with the situation no matter what happens.”
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