Patchell, 23, has two Wales caps, both earned on the 2013 summer tour to Japan.
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Giles, 18, is currently part of Wales’ U20 Championship squad competing in Manchester. He scored two tries in his side’s opening Championship game and will link up with the National Squad immediately.
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Further injury updates will be made available in due course.
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Giles and Patchell called to NZ
Wales have called Rhys Patchell and Keelan Giles to New Zealand as injury cover.