The central midfielder has been actively looking for a transfer to secure regular first team play time throughout the summer.
Van den Berg had been hoping to sign for PSV Eindhoven in the Dutch Eredivise.
However, they could not match the asking price that had been set by the Reds.
Now David Ornstein of The Athletic states that the Dutchman will be heading for a permanent move to Premier League rivals Brentford.
Van den Berg had been upset at the £20 million to £25 million price tag put on his head.