The Brazilian midfielder has represented his country at under 20 level and Sky Sport Italia report that the move was completed yesterday.
He joins the Brazilian contingent at Lazio which includes Andre Dias, Hernanes and Ederson.
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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.