Sky Sports understands several sides are tracking Brighton defender Inigo Calderon.
The Spanish right-back has been a revelation since arriving on a free transfer from Alaves in 2009.
Calderon helped Brighton win promotion from League One last season and also contributed to the Seagulls consolidating in the Championship this term.
The 30-year-old's consistent form has attracted interest from other clubs, with the likes of Leeds, Bristol City and Championship new boys Huddersfield all admirers of the full-back.
All three clubs are believed to be keen to bolster their defensive options and Calderon is thought to be on their list of targets.
Brighton would be reluctant to lose Calderon, with the player an established member of Gus Poyet's side.