Sunderland loanee Jonny Williams is attracting interest from elsewhere in the Championship, according to fresh reports.
Birmingham City are weighing up a £2million January bid to Palace for the Wales international midfielder who joined the Black Cats in a season-long loan deal on deadline day.
Reports suggest the Premier League side have the option to recall Williams should a serious bid come in for a permanent move from elsewhere.
The 23-year-old has made five appearances for Simon Grayson's Sunderland side since arriving, his latest as a second half sub in the 2-2 draw with Preston North End.
Williams, who has previously had loan spells at Ipswich Town, MK Dons and Nottingham Forest, was part of the Welsh squad that reached the semi-final stages of the 2016 European Championships.