He has signed a contract with Watford through to 2012, with his deal at Birmingham due to expire this summer. The centre-back made 117 appearances for Blues, scoring three goals.
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Wayne Rooney has returned to Everton after 13 years at Manchester United.
Germany defender Antonio Rudiger has joined Chelsea from Roma on a five-year contract.
Wayne Rooney has returned to Everton after a record-breaking career at Manchester United.