Crystal Palace have had an £18.5m bid for Blackburn midfielder Adam Wharton rejected.
The 19-year-old, who was born in Blackburn, made his debut for the Championship club in August 2022 and has made 44 appearances.
In December he extended his deal until the end of the 2027-28 season.
Palace have been watching him this season, and Newcastle, Everton and Tottenham are also known to have been interested in the youngster.
The under-20 England international plays alongside his younger brother Scott at Blackburn.
Crystal Palace have won just one of their past 12 matches in all competitions and are 15th in the Premier League.