The Portugal international, who had never previously failed from 12 yards for United, looked to have passed up the visitors' best chance of victory at St James' Park when Karl Darlow produced a magnificent stop.

That spot-kick came after Harry Maguire – fit despite a knock on international duty – cancelled out a second-minute Luke Shaw own goal, with United dominant but set to be frustrated heading into the closing stages.

A rapid counter-attack produced the breakthrough moment, though, as Fernandes picked out the top-right corner before Aaron Wan-Bissaka lashed in a third and Marcus Rashford finished the 96th-minute fourth, ensuring United bounced back from the 6-1 defeat to Tottenham Hotspur by winning all three points.