LONDON: Manchester City have signed French central defender Aymeric Laporte from Spanish club Athletic Bilbao, the Premier League leaders said on Tuesday. British newspapers reported that City paid a club-record 57 million pounds ($81 million) for the 23-year-old Laporte who has signed a contract until 2023. City coach Pep Guardiola wanted to add another centre back to his squad to challenge Nicolas Otamendi and John Stones with ongoing injury concerns surrounding captain Vincent Kompany. Laporte, a left-footed defender, was a first-team regular at Bilbao since breaking through in the 2012-13 season and he helped them win the 2015 Spanish Super Cup.