Real Madrid legend Raul has agreed a deal with North American Soccer League side New York Cosmos.
Gus Poyet hopes Sunderland will soon be in a position to flood their ranks with home-grown talent, rather than recruits.
The Scottish champions are understood to have shown an interest in the FC Groningen defender, and the player is now hoping they push through with a deal.
Van Dijk had attracted interest from England, with newly promoted Cardiff City and Championship outfit Brighton both keen, however, the player seems to have his heart set on a move to Glasgow.
"Celtic is a fantastic club and a step up for me," he told De Telegraaf.
"I now have to wait until the clubs agree."