Eight Championship players are one yellow card from a ban

Among the first 20 players shown on the Most Cards leaderboard, the worst cards-per-appearance figure belongs to Brayann Pereira. He has one red card from one appearance, which gives him a rate of 1.00.

One match and one refereeing decision can't show whether a player has a discipline problem, so I'm not reading anything into it. His rate will mean something once he has 15 appearances.

The ten players on the most cards right now

Ten players have four cards each on the Most Cards leaderboard.

Clarke-Salter and Harry Clarke top the rate column only because they've played a game fewer.

Fouls are counted separately again. Freddie Draper has 34 on the Bad Boys leaderboard and Jenson Metcalfe has 21.

The yellow cards Championship teams collect per match

Watford have 23 yellows from eight games, an average of 2.88 a match. Blackburn Rovers are on 2.63, Lincoln City 2.50, and Preston and Stoke 2.38 each.

Whatever's behind it, a squad booked that often starts losing players to bans. The practical effect is easier to call. A squad booked that often will start losing players to suspensions, and those bans usually land at awkward times.

What a fifth yellow actually costs

Five yellows up to and including a club's 19th EFL league match bring a one-match ban. Ten by the end of the 37th cost two games. Fifteen by the last league day before the play-offs mean three. At 20, a regulatory commission decides the sanction.

Jake Clarke-Salter has four yellows from seven appearances for QPR. One more inside that 19-match window and he sits out. If I were making the call at QPR, I'd name his cover this week and get that player training with the back line now. His first match alongside them shouldn't be the one after the ban starts.

I wouldn't pull Clarke-Salter aside for a quiet word about being careful. A centre-half worrying about his fifth booking stops stepping across the striker, and QPR would concede more goals that way than a one-match absence would cost them.