The 25-year-old has cemented the left-back berth at Stamford Bridge and played a big part in a strong start to the season for Jose Mourinho's men.
Azpilicueta joined the Blues from Marseille in August 2012 and has made 95 appearances to date for the club, winning the Players' Player of the Year award last season.
He made his senior international debut for Spain against Qatar in February last year, and was part of this summer's World Cup squad.
After their enthralling 6-3 victory over Everton on Saturday, Chelsea top the Premier League table with three wins from as many games.
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