The new deal will keep the 20-year-old at Rennes until the summer of 2015. The midfielder’s previous deal was due to expire in 2014.
Real Madrid, Manchester United and French side Marseille have all been linked with the youngster in recent months.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?