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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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?