The naturalised Italian midfielder is set to play at the Nou Camp for the first time since he was sent off playing for Inter Milan in the 2010 semi final.
His presence will be useful for Paris St Germain, who are missing Blaise Matuidi.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.