Town are one of a number of Championship clubs reportedly keeping tabs on Portsmouth left-back Dan Butler, who is out of contract next summer.
The Blues, Brighton and Millwall are amongst the sides eyeing the highly-rated 20-year-old Pompey youth product, according to Sky Sports.
Butler broke through into the Portsmouth team during 2012/13 and, having spent time on loan with Havant and Waterlooville and Aldershot, has now made 24 starts and five sub appearances for the League Two club.