Ake arrived at Stamford Bridge in July 2011 and made his debut as a late second-half substitute in a 1-0 victory at Norwich City in December 2012.
Since then, however, the dreadlocked 20-year-old has made only sporadic first team appearances.
The midfielder also spent a month on loan at second tier Reading last season.
(Writing by Tony Jimenez, editing by Pritha Sarkar)
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