The Championship outfit have agreed a £1.5m deal with NEC Nijmegen for the Dutch striker.
According to Yorkshire Evening Post, the player arrived in England yesterday and personal terms have already been agreed with the player.
The report adds that Grot completed his medical this morning and the striker will be unveiled soon.
Grot is expected to replace the French forward Souleymane Doukara. The Frenchman is heading to the Turkish club Osmanlispor.
The Dutch forward played 20 times for NEC last season and is expected to debut against Nottingham Forest on Saturday.