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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.