Blues boss Jose Mourinho is being linked with a move for the Serb this week.
The former Chelsea player left Stamford Bridge for Portugal in 2009 as part of the deal that brought David Luiz to the club.
"To be honest I want to stay in Lisbon for another year. But of course, if someone like Jose Mourinho wants to bring me back to London, that would be a chance to prove that I can play in the Premier League," confessed Matic earlier this year.
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