"If we concede a goal like this to a team like Manchester City or United or Tottenham, then you risk conceding three goals in 10 minutes," Sarri told reporters.
"I am happy with the confidence, it wasn't easy to play with this confidence after the last match. We have to do better but I think that the performance was a good performance."
Sarri also demanded consistency from his squad that has had mixed results in 2019, as the sixth-placed side face a tough run of potentially season-defining fixtures in the coming two weeks.
The London side face Manchester United in the FA Cup on Monday, host Malmo in the second leg, then head to Wembley for the League Cup final against Man City before meeting Tottenham Hotspur in the Premier League three days later.
"We need to have continuity and consistency, in the mental condition to be able to approach every match with the same level of application, determination and attention," Sarri added.
"If you are in bad mental condition in England, in ten days you can lose three or four very important matches. We have to approach every match in the same way."
(Reporting by Rohith Nair in Bengaluru; editing by Sudipto Ganguly)
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