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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.