Raphael Varane will reportedly undergo tests in the coming days to assess the next steps taken to handle his problematic knee.
The young Frenchman initially returned to playing in October after a six-month lay-off from surgery on the joint, having suffered a torn meniscus in May.
However, Varane has not played now since the start of November, after suffering discomfort in the same knee, with it regularly becoming inflamed after matches and stopping him from being able to play two consecutive games.
Carlo Ancelotti explained that the break from playing was to give the 20-year-old a required rest to try and recover, but that this would be between 10 and 12 days.
Having passed beyond that length of time now, AS report that the player is set for a vigorous set of tests in the coming days to push the knee to its maximum, to see how it reacts.
Should the joint respond as is hoped, then the player will be able to rejoin his teammates, but if it does not then he faces specialised treatment and the possibility of a second surgery increases.