The 21-year-old has penned a four-year deal with the Rams having helped them reach the Championship play-off final last season while on loan.
"I am sure the fans will be delighted to welcome him back and we're equally pleased that he sees Derby County as the right place for him at this point of his career.
"It's taken a lot of hard work for us to get to this stage but I think it says a lot about where we are at as a club that we've been able to bring someone like George in permanently."
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