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Not an extension.
Antonio Conte has finally put pen to paper on a new contract at Chelsea, whom he steered to the Premier League title in his first year in English football, to ease any immediate concerns over his future, though the Italian has not extended his commitment to the club beyond the next two years.
https://www.theguardian.com/football/2017/jul/18/antonio-conte-chelsea-new-contract
Conte just signed an extension on his contract in july so if chelsea were to pull the plug it will cost Roman a lot of money with a pay off.