"They have to help the players during the match", said Sarri. But the Italian has until now ignored the England player in the Premier League, to the fans frustration in a disappointing season - and he caused outrage last week when he revealed he had only watched 20 minutes of the youngster's full global debut in the 5-1 win in Montenegro.
"I expected problems. We had to face difficulties, and we have".
"They were probably unhappy for the result".
The under-fire Blues head coach has endured a hard first season in English football and was subjected to chants of "we want Sarri out" from unhappy travelling supporters at Cardiff on Sunday.
"We know that we are reliant on playing well and the opposition playing poorly - anything different to that then the top-six teams are generally always going to win".
"I know very well Callum and I want him to improve more because the potential is there. I can understand well the frustration of our fans".
With Gonzalo Higuain having failed to hit the ground running at Chelsea, manager Maurizio Sarri has now commented on the striker's struggles in the Premier League. "Maybe our fans thought that it would be easy for us".
Chelsea boss Maurizio Sarri conceded his team had been fortunate to escape with three points that kept their top four bid alive.
Sarri's decision to rest Eden Hazard and N'Golo Kante at the weekend and his continued reluctance to hand 18-year-old winger Callum Hudson-Odoi a first top-flight start have contributed to recent supporter unrest. "In my opinion, in that moment, he wasn't ready to play at this level".
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"Neil [Warnock] told me he was sure it was offside by two yards", Sarri added.
Cardiff will continue their survival battle away at Premier League title challengers Manchester City on Wednesday night.
Sarri did, however, advise the disgruntled Chelsea fans to stick with the players during matches and leave their barrage of criticism for after the full-time whistle.
"In the end we deserved to win".
'We need to improve playing our way of football.
Higuain played arguably the best football of his career that season under the guidance of Sarri as he went on to score an impressive 38 goals from 42 appearances in all competitions. In my opinion, he is our future.
"I decided at the beginning of the season that he had to stay with us, and I put him in the squad".
"Now he's ready to play".