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"I can't wait to get stuck in and try my best. I've been really impressed with the whole set-up and it's very professional and welcoming," he said.
Mayhew's arrival on Tyneside gives the club an added boost with South African centre Corne Uys also expected to complete the relevant paperwork within the next two to three weeks prior to his move to Kingston Park.
Head coach Alan Tait said: "I've looked at the videos of him playing for North Harbour and he is a quality player. We need cover at hooker and the signing of Michael means we will not be exposed in that area."
Newcastle begin their Amlin Challenge Cup campaign wiht a home game against newcomers Lyon Rugby on Saturday, 12 November.
