According to The Daily Star, Swansea City will not sell Alfie Mawson to West Ham United for anything less than £50m.
West Ham have been linked with a move for Mawson this month and have been hoping to lure him away from Swansea with the prospect of a major wage increase.
But Swansea boss Carlos Carvalhal is desperate not to sell his star defender in the middle of a relegation battle as Celtic and Everton also circle around the England youth international.
Swansea are demanding £50m for Mawson in a hope that this will completely fend off any interest from rival clubs.
The former Barnsley defender has played 52 games for Swansea since his arrival from Oakwell in summer 2016 and he was a key performer for the Swans last season as they stayed afloat in the Premier League.
West Ham are looking for a new centre half as Jose Fonte remains out injured and Winston Reid and James Collins continue to spend time on the sidelines with recurring injury concerns.
Mawson was identified as a top target but this price tag is likely to deter the Hammers.
West Ham had hoped that £25m and Andre Ayew might tempt Swansea into selling the 23-year-old but they appear to have been rebuffed.