AFC Bournemouth have signed Christian Atsu from Chelsea on a season-long loan deal.
Midfielder Miguel Pallardo has signed a new one-year deal with newly-promoted Hearts while Danny Wilson leaves.
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."