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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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
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