Swansea City are holding talks with Middlesbrough over Rhys Williams, Sky Sports understands.
The Premier League outfit have been long-term admirers of the Australian international, who is product of Boro's acclaimed academy.
Williams, who also represented Wales at Under-21 level, is predominately a central defender, but is equally at home at full-back or in central midfield.
The 25-year-old is understood to be valued at over £1million by Boro, who are ready to agree to the deal - which will enable manager Aitor Karanka to bolster other areas of his squad.
Williams, who was captain of Boro under Tony Mowbray and has played 113 times for the Teesside club, could complete his move within the next 48 hours.