Newcastle United have confirmed the signing of Montpellier defender Mapou Yanga-Mbiwa for a fee believed to be in the region of £7 million, with the player penning a five-and-a-half-year deal at St James' Park.Newcastle United have confirmed the signing of Montpellier defender Mapou Yanga-Mbiwa for a fee believed to be in the region of £7 million, with the player penning a five-and-a-half-year deal at St James' Park.