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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.