Martin is reportedly Southampton-bound and Duff is said to be in the frame to take over from him at the Swansea.com Stadium. Losing Duff would be a blow for Barnsley, who he led to the League One play-off final last season.
He is just one year into a three-year contract he signed at Oakwell last year after leaving Cheltenham Town. Here are the nine favourites to replace Martin at Swansea as listed by BonusCodeBets.
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