Jose Mourinho felt his Manchester United side should have scored several more goals against Burnley, criticising his side for not putting the game to bed when they had the chance.
United won the match 2-0 at Turf Moor, but following a red card to Marcus Rashford were put under pressure from Burnley, who threw on additional attacking power to try and take advantage of their extra man.
Paul Pogba meanwhile saw a penalty saved by Burnley goalkeeper Joe Hart, when the teams still had 11 men apiece.
After the final whistle had gone, Mourinho told BBC Sport in his post-match interview: "Burnley played very well as a team, and there were very good individual performances and we should score many more goals.
"The result shouldn't have been open until the last minute."
Pogba's penalty miss, which saw the Frenchman take a very long and exaggerated run-up before Hart guessed correctly, meant that United weren't as far out of sight as they perhaps should have been.
However, Mourinho refused to criticise Pogba before suggesting that naivety cost Marcus Rashford dearly as he was sent off for lashing out at Clarets defender Phil Bardsley.
"I never blame a player for missing penalties. I blame the ones who refuse to go up there. Paul's scored some good ones for us."
"I don't know what happened. I would say it was naive. It was a kid and a very experienced man. Bardsley's been in the game for 20 years and Marcus is a naive boy."