Reading caretaker manager Brian McDermott said Griffin is "hungry" to play after finding opportunities at Stoke limited this season.

BBC: Stoke City's Andy Griffin signs for Reading on loan

CNN's Ashleigh Banfield, Drew Griffin, Dave Alsup, Carol Cratty, Brian Todd and Barbara Starr contributed to this report.

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CNN's Drew Griffin, Carol Cratty, Nick Paton Walsh, Brian Todd, Barbara Starr, Susan Candiotti and Greg Botelho contributed to this report.

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