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.
Next Swansea City manager: Barnsley FC head coach Michael Duff made favourite ahead of ex-Chelsea, Southampton and Bristol City bosses
Barnsley head coach Michael Duff has been installed as the favourite to succeed Russell Martin as Swansea City boss.
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