Tottenham ended Chelsea’s unbeaten start to the season with a 3-1 win at Wembley on Saturday.
Goals from Dele Alli and Harry Kane put them two up inside 16 minutes and Son Heung-min made it three after the break with a brilliant solo goal.
Chelsea bagged a consolation goal through substitute Olivier Giroud.
Cesar Azpilicueta has vowed the players will learn from the defeat to Tottenham.
“It’s a tough one to take,” Azpilicueta said.
“We have to do better and it hurts to lose in this way. We have to learn from our mistakes, to improve and come back as a team.
“We need to be strong and get back to winning ways.”
Azpilicueta also admitted Chelsea haven’t started games well in recent weeks and the Blues paid for it against Tottenham.
“The start was really bad. After 15 minutes being 2-0 down is tough to come back from,” Azpilicueta said.
“It’s true in the last couple of games we didn’t start the game in the way we have to start. In some ways we didn’t pay for it, but we paid for it straightaway against Tottenham. When you have this handicap it’s tough.
“Tottenham are an aggressive team, they press well, and we were not able to get out with the ball and play our football.
“We knew if we could get a goal we would be in the game, but it went in the other way. At 3-0 we tried to fight until the end but we were not able to get anything from the game.”