Jose Mourinho is planning a fresh raid for Benfica defender Alex Grimaldo.
This is after United ran, 1-0 win over Benfica with the Red Devils winning their Champions League game in Lisbon on Wednesday.
Mourinho has set his eyes on Benfica left-back Grimaldo, who excelled for the Primeira Liga titleholders.
Mourinho has instructed scounts to keep tabs on former Barcelona starlet, according to the Sun
Left-back has been a problem position at Old Trafford this season, with injuries to Marcos Rojo and Luke Shaw.
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The 22-year-old is a Barcelona academy product, who spent four years in the Catalans' B team before a bargain £1.4million move to Benfica in January 2016.
Barca are entitled to a percentage of any future sale of the ace has a £50m release clause written into the deal.