Crystal Palace have received a bid that could rise to £7.6m from PSV Eindhoven for Netherlands international full-back Patrick van Aanholt after their first £4.2m offer was rejected.
Van Aanholt has 18 months remaining on his contract and the Eredivisie club are determined to sign him before the transfer window closes on Friday.
The 29-year-old, who joined Palace in 2017 from Sunderland for a fee in the region of £14m, has scored twice in 17 appearances in the Premier League this season.
Van Aanholt would be returning to PSV after spending a period of his career at youth-team level before Chelsea brought him to England in 2007.
The defender, who has made 10 appearances for the Netherlands, has played senior football in the Eredivisie during a loan spell from Chelsea with Vitesse between 2012 and 2014.
How to follow the January transfer window with Sky Sports
Sky Sports will bring you the very latest news from the January transfer market with the return of three shows.
Start your day with Good Morning Transfers at 9am as our team of reporters bring you the latest news and insight. Transfer Talk then follows at midday delivering analysis of the biggest stories. Then join us at 7pm for the definitive round-up of the day's news with The Transfer Show.
Meanwhile, the Transfer Talk podcast will also be back at the turn of the year with more expert analysis from here and across the continent.
And as well as tuning into Sky Sports News, don't miss a thing with our dedicated Transfer Centre blog.