The Telegraph reports that United manager David Moyes steps up his interest in the midfielder ahead of the January transfer window.
United failed to complete a move for the 24-year-old on transfer deadline day lat month.
The Premier League champions were reluctant to meet Herrera’s £30.5million escape clause.
United plan to watch Herrera in action for Bilbao against Granada as they are keen to bring in an attacking midfielder in January.
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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.