Meanwhile, Christsensen's father this week suggested that the defender could look to leave Chelsea in January if he continues to be overlooked.
Sarri added that Denmark worldwide Christensen, 22, is part of his plans for the future.
The German side were keen on signing Christensen permanently but Chelsea brought him back and Antonio Conte put him in the starting XI last season.
The Denmark worldwide is also yet to start in the Premier League, which is alarming to the player's father, who told Danish television: 'If his situation doesn't change around Christmas, we'll obviously schedule a chat with Chelsea and say, 'okay, what can we do for Andreas?
Sten said: "If his situation doesn't change around Christmas, we'll obviously schedule a chat with Chelsea and say, 'okay, what can we do for Andreas?"
However, Italian coach Sarri has hit back revealing that Christensen can be a very important player in the future. So I think that for his father the Europa League is probably not important, but for us it's important'. Can we move him?'
"What can I say?"
"I think in the first part of the season David and Rudiger have played very well so it is not easy to change".
"In our last six matches, Christensen has played in three matches". "I think he has to improve". But I think that he's a technical defender, so I think he is suitable for me and my way of football.
"For me it's not a loan again".
"In the last month I think Morata has played better and in the last three days I have seen him do very well in training".
"I think they don't know me very well", said Sarri.
'I think, unfortunately, Chelsea have too many players who just go out on loan if [the club] isn't going to use them and I don't think Andreas should get caught in that.