Athletic Bilbao confirmed on Friday that they have rejected an offer for Ander Herrera, who is reported to be the subject of interest from Manchester United as the transfer deadline edges ever closer.
The Spaniard is one of the most highly-regarded young talents in La Liga and as often been linked with a transfer to a club of greater standing in European football, with Manchester United a notable potential destination.
Manchester United are reported to have identified the 24-year-old as a potential acquisition as David Moyes strives to add a creative influence to his Old Trafford midfield before the close of the transfer window on Monday.
Athletic have since revealed an offer has been made for Herrera, although it is unclear if this formal approach for the Spain under-23 international was made by Manchester United.
"There is an offer [for Ander Herrera," the club's president Josu Urrutia confirmed on Twitter.
"Our club is different, based on sentiment. Our goal is not to make money.
"Last night received the proposal, and we have said we do not negotiate for our players."
If the bid was made by Manchester United, however, Urrutia has informed them that they must activate the player's release clause if they are to conclude a deal.
He added: "For a player to go first the player has to express his desire to leave and the club must pay the release clause."