Sky Sports understands that Barnsley have rejected an offer from Norwich City for Jacob Butterfield.
The England Under-21 midfielder looks set for a switch to Carrow Road after rejecting the chance to remain at Oakwell.
Barnsley had hoped that they had persuaded Butterfield to stay put, but a late move from Norwich has seen them seemingly win the race for his signature.
Norwich have now made a firm offer for Butterfield, as Barnsley will need to be compensated due to his age.
However, Sky Sports understands that Barnsley consider the original offer as 'derisory' and are ready for the matter to go to a transfer tribunal.
The 23-year-old missed most of last season due to a knee injury but he is now fully fit and ready for pre-season.