West Ham United will have to fork out £25million for Anderlecht defensive midfielder Leander Dendoncker.

Manchester United, Chelsea, Manchester City and Everton have also enquired about the Belgium international.

The Hammers, however, are desperate to sign another midfielder and are tempted to pay overs now for a player whose value could skyrocket if he has a successful World Cup with the Red Devils.

"Dendoncker is the centrepiece of our defence. If we let him leave it has to be for a lot of money," Anderlecht chief executive Herman van Holsbeeck said.

"We also have to find a replacement for him, even if it is a loan for six months.

"A deal can be done if the interested club puts 25 or 30million euros (£22m-26.5m) on the table for him.

"I've experienced plenty of difficult transfer windows, but this one is the trickiest of all."