He signed for Brighton from Blackburn ahead of their promotion-winning Championship campaign in 2016-17, and then went on to help establish the Seagulls in the top flight under Chris Hughton.
Brighton are also about to sign central defender Levi Colwill on loan from Chelsea, following Marc Cucurella’s expected permanent transfer in the opposite direction.
Duffy’s most recent loan spell was at Celtic during the 2020-21 season.
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