Pato sported tweed flat cap and a blue cardigan over a white t-shirt as he walked through arrivals at Heathrow Terminal 3.
He will provide competition for first-choice striker Diego Costa while also offering options in a wide role similar to the one he flourished in with Sao Paulo.
The addition of the 26-year-old gives Chelsea a fourth senior striker in their first-team squad, although either Loic Remy or Radamel Falcao could be on their way out later this month.
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