United have already had a £21million bid for the 24-year-old rejected by the Spanish side.
Bilbao want United to meet Herrera’s £25.5million buyout clause.
Bilbao president Jose Urrutia said: “For a player to leave he needs to state his intentions to leave and (the club) pay the buyout clause.”
Reports claim Herrera is keen on a move to United before the transfer window closes.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?