Metro reports that United have been told the Spain Under-21 player is available for a bargain £6million.
United boss David Moyes is desperate to bring in an attacking midfielder in January after having failed to land Cesc Fabregas and Ander Herrera in the summer.
Roberto has just 18 months left on his current contract with Barcelona and his agent has offered him around.
The highly-rated midfielder reportedly interested in a January move to Old Trafford.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?