The Brazilian is currently in his second full season with the Blues and has scored eight goals in his 26 starts for Andre Villas-Boas' side during this campaign
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The Brazilian arrived in west London in 2010 after from Portuguese outfit Benfica for £18 million and has contributed eight goals in his 26 starts this season.
The news comes as a boost to Chelsea, who currently sit fifth in the Premier League in their most difficult campaign since Russian owner Roman Abramovich took over eight years ago.
The 24-year-old has given the Blues' ageing midfield a new lease of life since signing and is seen as part of Andre Villas-Boas' long-term project.
Ramires was back in action this weekend, after a three-week absence following his recovery from a knee injury, and featured in Chelsea’s 1-1 draw with Birmingham City in the FA Cup.