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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Being an amiable guy is good for you and Jurgen Klopp is living proof.
Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.