It was a largely unconvincing performance from the visitors, who made the most of their one clear-cut opportunity in a comfortable first half and spent the majority of the second on the back foot.
Mourinho questions validity of the League Cup
Manchester United are on the road in Gameweek 6 of the Premier League as Southampton host them in a tricky away fixture at St. Daley Blind - Luke Shaw played for 45 minutes, but as of now, the race to be the left-back is between Blind and Young.
Who will come out on top in the battle of the managers Mauricio Pellegrino or José Mourinho?
As for United, they showed their teeth as patience in possession bore fruit in the 20th minute.
He scrambled a 20th-minute victor, pouncing on his own rebound in the six-yard box after the home team's keeper, Fraser Forster, had parried the striker's close-range header following a superb cross from the left by Ashley Young.
However a second effort from no less than two yards out from goal was prodded home by the forward to give United the lead following a promising start from the hosts.
WILBUR ROSS: China 'sent a very powerful message to North Korea'
China, North Korea's most important trading partner, is one of the pariah state's few sources of hard currency. South Korea's government said it was the first direct address to the world by any North Korean leader.
"For a player to hear that sung about themselves, I do think they'd think it was amusing, a bit of a laugh".
Fellaini cleared a Dusan Tadic header from just in front of the line and the winger dragged a low cross inches past the right-hand post moments later, before Herrera blasted over the crossbar when given time and space to pick his spot on a rare United attack.
The 24-year-old suffered an injury in the early stages of Manchester United's Champions League win over Basel earlier this month, but may not necessarily need a procedure.
Kim calls Trump 'deranged' as Pyongyang hints at H-bomb
Hours later, North Korea's foreign minister reportedly said his country may test a hydrogen bomb in the Pacific Ocean. Japanese Defence Minister Itsunori Onodera noted such a test could mean a nuclear-armed missile flying over Japan.