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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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?