Oscar joined Chelsea from Brazilian outfit Internacional in the summer of 2012, costing the west London club around £20million.
He won the Europa League in his first campaign and went on to clinch the Premier League and League Cup under Jose Mourinho in the 2014/15 campaign.
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Jose Mourinho refuses to criticise Oscar for big-money move to China
Wenger: Oscar's China move worrying for Premier League
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Oscar will earn a reported £400,000 a week at Shanghai SIPG
The Brazil international has now joined Chinese Super League side Shanghai SIPG for a stunning £60million, where he'll earn a reported £400,000 a week.
But Mourinho, who worked with the 25-year-old for two-and-a-half seasons at Stamford Bridge, insists he cannot criticise a player for following the money.
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Jose Mourinho has no problems with players choosing to move to China
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“My opinion is that everyone is free to choose his life," Mourinho said when asked about Oscar's big-money move to the Far East.
"And I am no-one to criticise anyone or give an opinion on that. Everyone is free to choose what is their priorities."
Oscar found first-team opportunities hard to come by following the arrival of Antonio Conte in the summer, starting just five Premier League games this season.