Caulker made just 12 appearances total in all competitions with both Premier League clubs but it is believed that Tony Pulis ready to make a move as Albion get set to offload James Chester, who has been linked with Swansea City.
The 26-year-old is contracted with the Villans until the summer of 2020 but is wanted by their West Midlands rivals and the lure of staying in England's top flight could be too much to overlook.
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