Everton's Gerard Deulofeu and Sunderland's Patrick van Aanholt battle for the ball. Picture credit: Tim Goode / EMPICS Sport

Everton’s Gerard Deulofeu and Sunderland’s Patrick van Aanholt battle for the ball. Picture credit: Tim Goode / EMPICS Sport

Sunderland have agreed a fee which could eventually rise to £14million for defender Patrick van Aanholt with Premier League rivals Crystal Palace.

The Eagles have been given permission to speak to the 26-year-old Dutchman, who had submitted a transfer request, and he will now travel to London in a bid to push through his move.

Black Cats chief executive Martin Bain said: “If a player openly states he does not want to play for our club, then it is clear that we have a decision to make. In this instance and in regard to this particular player, we have done what we feel is right for Sunderland, which will always be our priority.”