Pep Guardiola called on Manchester City to learn the lessons of a 1-0 home defeat to Manchester United despite progressing to a third successive League Cup final 3-2 on aggregate.
The holders enjoyed the vast majority of the chances but could not find a way past the inspired David de Gea and went behind to United's first attempt on goal 10 minutes before half-time when Nemanja Matic fired home.
United's hopes of completing a miraculous comeback were extinguished when Matic was then sent-off 15 minutes from time and City held on to face Aston Villa at Wembley on March 1.
"In 180 minutes we were better than United," said Guardiola.
"We created chances to score a lot of goals and didn't convert. We need to learn to be more clinical."
"For me Manchester United didn't have one chance today."
"It's hard to go here and score a goal with 11, nevermind 10," said United boss Ole Gunnar Solskjaer. "It's never a sending off for me - it's a joke."
"They've beaten City now twice at their place. They've given us everything."