The 37-year-old joins up with the Merseyside club after spending one season at St James´ Park and will fill the assistant manager´s role under David Moyes which has been vacant since Alan Irvine became Preston boss in November.
A compensation deal is believed to have been thrashed out allowing Round to leave the north east after the Magpies had blocked previous attempts to conclude the move because they insisted he was not out of contract.
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