Metro reports that the United boss is looking to strengthen his defence before next Monday’s transfer deadline.
United scouts watched Porto’s game with Maritimo at the Dragao stadium on Sunday.
United face competition from Barcelona in the race to sign the 22-year-old France 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.