This week he's just started to do a few things with the group, so let's see how he does in the following weeks.Aitor Karanka
The pacey forward, who was signed by Blues from neighbours West Brom at the end of August, has been sidelined since December 2019 after suffering an ACL injury during his loan spell with Charlton Athletic.
But the Blues boss is hopeful the England Under-20 international could return to first team action within a matter of weeks, barring any setbacks.
"Leko is really good and he's started (training) with the group and the following two weeks (the international break) will be really important for him," said Karanka.
"This week he's just started to do a few things with the group, so let's see how he does in the following weeks.
"We'll maybe play him in an Under-23s game. When you've been out for 10 months, one week or two weeks more or less is not important.
"He will need time and he will need to get his confidence."
Meanwhile, Josh McEachran is making good progress with his own ACL injury, which he sustained in February in an FA Cup tie against Coventry City.
But the midfielder is behind Leko in the recovery process.
"Josh McEachran, I think it will be another one or two months until he joins the group, but he's progressing really well," added Karanka."