Sheffield United, Celtic, Bournemouth and Genk are among the clubs showing an interest in Preston North End defender Ben Davies.
The 25-year-old has turned down Preston's latest contract offer and could sign a pre-contract this month and move for free in the summer.
Davies has been a regular part of Alex Neil's squad at the back having played 15 league appearances this season, though he missed eight games in the middle of the season due to a hamstring problem.
Davies is understood to have concerns about a move to Bramall Lane though with Chris Wilder's Blades struggling to find a win in this Premier League season.