Christensen not for sale but Cahill could leave Chelsea in January

The duo have struggled for regular minutes under Maurizio Sarri, prompting reported interest from other clubs

Chelsea defender Andreas Christensen is not for sale despite reported interest from AC Milan and complaints over a lack of game time, Goal understands.

Blues boss Maurizio Sarri has found it difficult to placate Christensen's desire for first-team football this season, having not used him once in the Premier League.

And the Denmark international has been linked with Serie A side Milan, who are keen to secure a new defender with Alessio Romagnoli the latest absentee in the club's injury crisis.

However, Christensen will not be on the market and Sarri has instructed the 22-year-old to remain patient, with Antonio Rudiger and David Luiz being Chelsea's current first-choice centre-backs.

Chelsea are more open to allowing Gary Cahill to leave with only seven months remaining on his current contract.

Cahill has enjoyed a glorious seven-year spell at the club, winning every major honour, but the 32-year-old has also expressed his frustration at a lack of regular minutes this term.

Gary Cahill, Chelsea

And Cahill's possible departure would allow Christensen, who has played every minute in the Europa League and Carabao Cup for Chelsea, more space to develop.

After playing 40 games under Antonio Conte last season, Christensen has faced repeated questions about his future at Stamford Bridge.

When asked if he would leave in January, Christensen told Sky Sports earlier this month: "Difficult question. No, I don't think so.

"Things are different from last season. I played a lot of games [last season] but this season it hasn't been like that. It's always difficult for a player but we'll see what happens."

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Sarri would ideally like to keep Christensen and Cahill in January, after giving the club captaincy to the latter, and instead allow Ethan Ampadu, 18, to depart on loan.

Ampadu recently renewed his contract but has had little game time as Chelsea's fifth-choice centre-back and he has interest from Championship duo Derby County and Aston Villa.

Chelsea are also keen to renew both Rudiger and Luiz's contracts, as well as star men Eden Hazard and N'Golo Kante.