Bayern Munich president Uli Hoeness has cast doubt on the possible arrival of Javi Martinez from Athletic Bilbao.
Hoeness took a swipe at the Spanish club as he told German news channel n-tv: "It does not look too good right now. The people at Bilbao are very, very stubborn and do everything they can to stop this transfer from happening."
His comments came after former Bayern manager Ottmar Hitzfeld said he did not believe the club needed to sign Martinez.
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Bayern and Athletic remain in talks over the transfer of Martinez, who has a release clause of €40 million, but Hitzfeld, now in charge of Switzerland, feels the Bundesliga side are already well stocked in midfield.
He told Abendzeitung Munich: "Bayern already have enough depth in midfield. But the men in charge will have made up their minds.
"A transfer fee that high can also be a heavy burden. You need a good start to steady the nerves."
Hitzfeld feels, however, that Martinez's presence could bolster the club's Champions League aspirations. He added: "Maybe he will offer the two or three per cent extra Bayern need to lift the Champions League trophy."
Meanwhile, Bayern's honorary president, Franz Beckenbauer, believes Martinez and Bastian Schweinsteiger could prove to be a "brilliant duo" in midfield.
Ex-Bayern midfielder Lothar Matthaus also rates Martinez, telling Sky Sport: "Martinez has quality as he was able to enjoy a good education. He is a technically good player with a good vision who is quick to receive possession.
"He is also a leader on the pitch - time will tell how quickly he will be able to show those skills for Bayern."