Maurizio Sarri has told Andreas Christensen he must improve if he wants to become a regular starter for Chelsea.

Christensen's father and agent, Sten, told Danish media on Friday that he would seek a permanent move away from Stamford Bridge for Andreas if his playing time did not increase.

Speaking before Saturday's clash with Manchester United, Sarri decided to send a message to the 22-year-old centre-back.

"I am not interested with the father," said Sarri at his pre-match press conference.

"I think in the first part of the season David and Rudiger have played very well so it is not easy to change. In the last 6 he has played in three. For his father the Europa League may not be important, but for us it is.

"He is young, he can improve. He is a technical player so is suitable for our way of football."