Erik ten Hag believes his team must look in the mirror at themselves after another mistake saw them drop points in their 1-1 draw with Burnley.
United had to wait until the 79th minute to open the scoring, when Antony put the home side in the lead, which looked like putting Ten Hag's side on the road to three points.
However, three minutes from time Andre Onana mistimed his jump for the ball and clattered Zeki Amdouni to give away a penalty.
Amdouni dusted himself off to take the spot kick and ensure Vincent Kompany's men earned a share of the spoils at Old Trafford.