The Dane played at the heart of Antonio Conte’s defence in the Italian’s famed 3-4-3 formation.
Despite being named Chelsea’s 2017/18 Young Player of the Season, however, Christensen has not been able to impress Sarri and is seeking regular first-team football.
Although a return to Monchengladbach is most likely, AC Milan have also been keeping tabs on the player.
But the Blues aren’t keen on selling Christensen who is believed to be growing unsettled at the lack of game time.
Chelsea transfer news: Andreas Christensen enjoyed a successful spell in Germany from 2015 to 2017 (Image: Getty)
Chelsea transfer news: Gary Cahill is set to leave the club in January (Image: Getty)
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Monchengladbach are hoping that they might allow him to spend the second half of the season with them.
That transfer cold all depend on the future whereabouts of club captain Gary Cahill, however, who has played only 21 minutes of Premier League football this season.
The England international has been told that he can leave the club in January.
Aston Villa and Galatasaray are keen on signing him after failing to get a deal done in the summer.