Foxes boss Brendan Rodgers had hoped to have Justin, who has been out since damaging his anterior cruciate ligament in February, available this month and the 23-year-old had been pencilled in to play for Leicester Under-23s against Tottenham on November 23.
Yet Rodgers revealed that the club have had to put the brakes on Justin's comeback bid. He said: "He had trained with the first-team squad for a few weeks and was looking very good.
"At that stage we wanted to get him into an Under-23 game but there was just a slight reaction to that which has put him back, but not for too long. I would say in the next five or six days he will join the squad again.
"We just have to make sure after a long time out we make sure he is ready to be back, and take it step by step. In those few weeks he looked absolutely brilliant."