Diniz started his career at Caxias Futebol Clube, of the Itararé quarter.
In June 2009, AC Milan re-acquired Diniz back from Livorno, in exchange for Romano Perticone,[3] though letting them keep the Brazilian on loan.
[4] Both players' 50% registration rights was valued €2.5 million[2] and the loan cost Livorno €150,000.
[8] For the 2011–12 season, he was loaned out again, this time to Lega Pro Prima Divisione club Como, where he made 26 league appearances and scored one goal.
[11] For the 2015–16 season, he joined to Lega Pro club Padova, signing a two-year contract.