Chelsea beat 1-0 Slavia Prague away Czech thanks to a goal from Marcos Alonso but the Blues faced lots of pressure from the home team.
Chelsea boss Maurizio Sarri revealed after the win that he was happy Chelsea suffered in the game without conceding.
According to Sarri, Chelsea have not coped well in adversity this season and he was impressed with how Chelsea rode out Slavia storms to pick up a third consecutive clean sheet.
“I’m really happy with the result, and also with the performance,” Sarri said.
“In this moment we are able to suffer, and in the past we were not able to suffer in the difficult moments of a match.
“In the past when we were in trouble, we immediately conceded a goal. Now we are able to stay in trouble to fight and to suffer without conceding anything. And so I think that’s a step forward for us.”
Chelsea boss admitted he knew the game would be a difficult one for Chelsea and revealed he warned his players Slavia Prague will cause Chelsea problems at Stamford Bridge.
Sarri added: “We knew very well to play here is very difficult. The opponents are very physical, very aggressive, so we knew we had to face difficulties during the match. We were able to face them well, then in the second half we were able to play better.
“Now we need to think the second leg will be difficult. These opponents are also very dangerous away, like against Genk [where they won 4-1]. We need to be careful.
“It’s very difficult to face them. Really very difficult.”
Some fans disgraced the club before the game against Slavia Prague after they were filmed singing vile chant about Liverpool forward Mohamed Salah.
Chelsea released a statement in which the club vowed to issue bans to those identified and three fans identified from the video were denied entry to the Eden Stadium to watch the game against Slavia Prague.
Asked if Chelsea were right to act firmly and bar those identified from the stadium, Sarri added: “Yes, I think it’s right. But you have to ask the club. I don’t want to speak about something I haven’t seen. It’s not right, I think, if I talk about something I know nothing about. Of course it’s right that the club has a very strong decision. I think that’s right.”