United have offered to meet Herrera’s 36million euros buyout clause.
Herrera will have to pass a medical and United will pay the full amount in cash.
United had a £21million bid for the 24-year-old rejected by the Spanish side last week.
Herrera is desperate to complete 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.