United were put on course for a routine victory when Lukaku headed them in front on 27 minutes and the Belgium striker doubled his tally with a close-range second a minute before half-time.The win comes after a turbulent start to the campaign under Mourinho, which included a 3-0 home defeat to Spurs on Monday Night Football.Mourinho was seen passionately clapping the home fans at the final whistle after that defeat by the north Londoners at Old Trafford, and he admitted that positive reaction from the crowd had had a huge effect on his team's mentality ahead of this important clash with Burnley.

"The quality of the performance and the happiness within the team is Old Trafford's responsibility," he said.

"The reaction after the game at Tottenham was fundamental to keep the team moving in the right direction."

Paul Pogba missed a second-half penalty and Marcus Rashford was dismissed for a headbutt, but United saw out the win comfortably - lifting them to 10th in the table - to ease the pressure on Mourinho.