Chelsea are set to keep hold of Fikayo Tomori this month.
Tomori had been hoping to secure a temporary deal this month after finding his first team chances limited at Stamford Bridge this season.
But centre-back Christensen has undergone scans on the injury suffered in the draw with Aston Villa.
And the club fear that will leave him sidelined for a period.
And Tomori is now seen as needed in the first team squad for the foreseeable future.