FC Utrecht chief Foeke Booy has branded FC Twente's unsuccessful bid for Kevin Strootman 'offensive' to the player.
Twente are chasing the signature of 21-year-old Strootman as a replacement for midfield ace Theo Janssen, who departed Enschede for Ajax on Monday.
But the Dutch giants have had an undisclosed offer for the youngster turned down by Utrecht, and technical director Booy was less than impressed by the bid.
"It's a bid that is actually offensive to Strootman," Booy told Algemeen Dagblad.
"I do not discuss amounts, but when I look at the qualities of Kevin, the offer of Twente must be proportional."
Booy knows there is a chance Utrecht could lose Strootman to Twente this summer, but insists a move is not set in stone.
He added: "I understand that a Twente move would be convenient, considering the rapid developments that Kevin goes through, but we are not eager to lose him.
"However, there are amounts that you cannot refuse."
Strootman, who arrived at Utrecht in January from Sparta Rotterdam, is contracted at the club on a four-year deal.
And his agent, Chiel Dekker, insists the midfielder could stay at the Stadion Galgenwaard this summer, adding: "It's not like Kevin necessarily wants to leave Utrecht."