Jon Brady was disappointed as Northampton Town exited the Emirates FA Cup with a 3-1 replay defeat at Cambridge United on Tuesday evening.
“The goals we conceded were very uncharacteristic for us and that is very frustrating,” he said.
“Cambridge sat deep and tried to hit us on the counter-attack and to concede after fifteen minutes from their first real attack took the wind out of our sails.
“We tried to get back in the game but unfortunately it was too far gone for us. We played some good football at times tonight, it was just frustrating to concede in the way we did.
“I know how we can defend and we are better than we’ve shown tonight and against Bristol Rovers at the weekend. We need to get back to the standards we know we can deliver, it would have been great to have had a cup run but we need now to make sure that we get ourselves right in the league
“Michael Harriman has cracked a rib tonight and that is a tough one to take for him and for us. Aaron McGowan came on and got through and that is one positive from tonight.”