Mundo Deportivo reports that United boss David Moyes will attempt to sign Roberto once the transfer window reopens in January.
Moyes is desperate to bring in a creative midfielder in January after having failed to land Cesc Fabregas and Ander Herrera in the summer.
United face competition from Premier League rivals Tottenham in the race to sign the Spanish under-21 international.
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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.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.