Knockaert missed the FA Cup draw at Huddersfield on Saturday with an ankle injury and the French winger may not be ready in time for Thursday night's game.
"He's the only concern really," said City boss Nigel Pearson. "He's had a scan and we'll just have to see how he progresses. It doesn't give us much time, but we'll see how he is.
"We've managed the other minor knocks that we've had as best we can but, again, it's a case of just seeing how they are."
Chris Wood began on the bench at Huddersfield after suffering a knee injury in training prior to the fourth-round tie.
He came on to rescue a replay for Leicester with a late equaliser and the Kiwi striker could be restored to the starting line-up.