Oscar will return to his former club São Paulo on a three-year contract, the Brazilian Serie A side said on Tuesday.
Former Chelsea midfielder Oscar, who made 48 appearances for Brazil's national team between 2011 and 2016, has spent the last eight seasons with Shanghai Port, winning the Chinese Super League title three times.
"I'm happy to be back in Brazil and to be able to play for São Paulo, which is the club where I started out, where I made my base and where I grew up," the 33-year-old said in a statement.
Oscar scored 38 goals in 203 appearances for Chelsea and lifted the Premier League, League Cup and Europa League trophies during his four-and-a-half-year spell.
He began his professional career at São Paulo in 2008 and joined Internacional in 2010, a move that led to a lengthy contract dispute between the two Brazilian clubs.
