Wolves defender Danny Batth is attracting attention from Hull City, Sheffield Wednesday and Aston Villa.
The Molineux club have brought in new defenders under their Portuguese regime.
Willy Boly arrived on loan from Porto and Roderick Miranda, signed from Rio Ave, started in the friendly with Leicester City on Saturday.
Rival clubs are monitoring developments to see if Batth figures in the plans of manager Nuno ESpirito Santo as the Championship season kicks off next week.