The club official expressed his frustration with the Spanish club's persistent lack of willingness to cooperate in negotiations over a move for the young midfielder
The retired striker is of the opinion that the Basques are deliberately raising obstacles to a potential deal, and the 60-year-old is hardly impressed with the Spanish club's obstinate approach.
"It looks at the moment that the transfer will not work out because the people in Bilbao are very, very stubborn and they are doing everything possible to prevent the transfer," he told N-TV.
"If the Athletic president was more willing to arrange a deal, he would accept €40 million rather quickly," he continued.
Despite meeting the 23-year-old's buy-out clause of €40 million, Bilbao have continued to resist a potential deal with Bayern even though the player himself has expressed a desire to make the switch.
"After learning that Martinez was happy to move, we felt that we could reduce our offer from €10 million per season to €8m.
"Still, it is a crazy amount. We feel we are able to do this because we feel that we have been right regarding the issues that have arisen," he concluded.