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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.