Son Heung-Min knows Tottenham must learn a "big lesson" from a 4-1 Premier League thrashing at Leicester City on Saturday.

Spurs beat second-placed champions Manchester City last weekend, but they were brought crashing back down to earth at the King Power Stadium.

Head coach Antonio Conte endured a painful return to the touchline after undergoing gallbladder surgery as the Foxes came from behind to strike a blow to Tottenham's bid to secure Champions League qualification.

Rodrigo Bentancur opened the scoring, but two goals in as many minutes from Nampalys Mendy and James Maddison put Leicester in front.

Kelechi Iheanacho gave Brendan Rodgers' side breathing space in first-half stoppage time and Harvey Barnes added a fourth goal on a miserable day for Spurs, who also suffered the blow of losing Bentancur to injury.

Forward Son told BBC Sport: "We started quite well and created chances. After it was 1-1 we conceded a quick second goal and then it was open. It was a difficult game then.

"Leicester were so clinical, they almost scored every chance. It's a very disappointing result.

"I think it's very sad. We knew it was going to be a really hard game. In the Premier League it's never an easy game. It showed the Premier League has a high level. I don't know what I can say, it's very disappointing."

3.8 - 128 goals have been scored in 34 Premier League matches between Leicester and Tottenham, with the average of 3.8 per game the highest such ratio among fixtures to be played more than 20 times in the competition. Bedlam. pic.twitter.com/eby7AkIoZy

— OptaJoe (@OptaJoe) February 11, 2023

Son did not feel Tottenham were guilty of turning up expecting to return south with three points.

Asked if complacency was a reason for their defeat, he replied: "I don’t think [it was]. We came with a good feeling after beating City. The first minute we were really on it. We should be ready and learn something.

"Today should be a big lesson for us."