Sunderland have accepted an undisclosed bid from fellow Premier League side Watford for defender Younes Kaboul.
The 30-year-old centre-back, who moved to Sunderland from Tottenham in 2015, has told manager David Moyes that he wants to leave for personal reasons.
Kaboul has been given permission to discuss personal terms with Watford.
"The club and the manager have shown an understanding of my personal circumstances and I am grateful for that," Kaboul told the club website.