With Napoli refusing to budge on their £70million valuation of centre-half Kalidou Koulibaly, the Premier League giants are considering alternatives.

Sport Witness reports that United "have been after his services since at least May 2017, back when Jose Mourinho was still manager".

And French TV channel Le10Sport add that the 19-year-old "could leave the principality in the coming weeks".

As well as United, Spanish outfit Valencia are thought to be chasing the defender.