The 21-year-old joined the Glovers on loan at the end of last month.
Duffy has made five Championship appearances for Yeovil and his extended stay will see him being able to face the likes of Leeds, Doncaster, Watford and Wigan next month.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.