Newcastle's patience is reportedly wearing thin over Arsenal's continued interest in Bruno Guimaraes, with the Magpies said to be growing frustrated by the Gunners' pursuit of their captain.
According to Sky Sports News' North East reporter Keith Downie, Newcastle would demand a fee in excess of £80m before entertaining any offer for the Brazilian midfielder, who has become a key figure at St James' Park since his arrival and has since been handed the captain's armband.
Arsenal are understood to view Guimaraes as an ideal addition to bolster their midfield options, but Newcastle's stance suggests they have no intention of letting their leader depart cheaply, if at all. The north-east club are said to be irritated by what they perceive as persistent interest from Arsenal, who will need to significantly raise their valuation if they hope to convince Newcastle to sanction a sale this summer.
For now, no formal bid has been reported, with the situation described as an ongoing point of tension between the two clubs.