Sir Alex Ferguson pointed to Michael Carrick`s missed penalty as a key moment in Manchester United`s shock 1-0 defeat at Premier League new-boys Burnley.
While the visitors dominated possession - apart from a little flurry from the Clarets that brought their goal - they had few decent opportunities.
Michael Owen failed to make contact with a couple of them, while neither Wayne Rooney nor Park Ji-Sung could find the net once Carrick had failed from the spot.
"It was a bad performance considering the chances and possession we had," said Ferguson.
"Maybe if we had got the penalty just before half-time it would have made a difference but in saying that we were too frivolous with the chances we had.
"It has been a long time out of the top flight for them and you cannot deny them their victory."