It is the second time Baggies boss Tony Mowbray has signed the promising young centre-back after taking him from Darlington to Hibernian in August 2006.
Martis made 34 appearances at the heart of the Hibernian defence last season and Mowbray believes the 24-year-old could go on to make a huge impact at The Hawthorns. He told the club´s official website: "He´s got huge potential which is why I want to give him the platform to perform."
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