Sheffield Wednesday defender Ash Baker is edging nearer to a ban.
The Wales Under-21 international has been cautioned four times in five Owls appearances this season. His latest yellow card came in the first half at Villa Park when he fouled Alan Hutton.
Baker was also booked against Hull City, Brentford and Wolverhampton Wanderers in the Carabao Cup.
Yellow cards accrued in the League Cup have ordinarily contributed to suspensions in the league but the EFL changed the rules for this season, meaning cautions picked up in the tournament will only be relevant to the Carabao Cup.
It means Baker, preferred to Liam Palmer on the right side of the Owls' defence in the last two fixtures, is two yellow cards away from being hit with a one-match suspension.
Baker and midfield maestro Barry Bannan, who has collected four cautions, will have to avoid yellow cards up to November 30.
Bannan accrued his fourth booking at home to Stoke City but did not collect yellow cards against Nottingham Forest or his old club Villa.
On Bannan's potential ban, Luhukay told The Star: “We must not go for the negative side and hope that Barry plays a very good game for us with gets no fifth yellow card and that he can also play the next game.
"But with every game now, you have that risk that Barry is a player who gets a fifth. But we try and think positive."