Swansea City boss Roberto Martinez was left disappointed after seeing his side lose 1-0 at home to Watford in the fourth round of the Carling Cup.
A Lee Williamson goal was the difference between the two sides at the Liberty Stadium, with Martinez admitting that his players had been well below their best.
He told the South Wales Evening Post: "My disappointment is the performance and the fact that we didn't reach the standards we have set throughout this season.
"The other disappointment is that we got heavily punished by a side who only created two chances. There wasn't much in the game, but we allowed them to win it.
"We are purists and we want to be perfect, but we have to learn to win games when we don't produce the perfect performance.
"We have to sense danger and don't give a goal away like we did here, because there were three mistakes in the lead-up to it and that's not like us.
"At Championship level there are many sides who are able to win games when they don't play well and they are up near the top as a result.
"That's something we've got to learn to do too."