FC Groningen chief Henk-Maarten Chin has set the price for Virgil van Dijk.
The youngster has attracted an offer from Brighton and is also interesting Everton and Newcastle United.
"I think from £2.5 to 3 million is a realistic amount. There are five Premier League clubs that have Van Dijk high on their list already. The question is what these clubs are going to do this week," said Chin.