Ill-discipline is creeping into the champions' game, and the Blues must learn to curb it if they are to retain their title this season
David Luiz became the latest in a long line of red cards for Chelsea when he was sent off in Sunday's scoreless draw with Arsenal.
The Brazil international was deemed to have gone in dangerously on Sead Kolasinac during the second half of the encounter, continuing a run of bleak discipline for the champions that threatens to undermine their title defence before it has ever truly got started.
Indeed, Antonio Conte's side have had four players dismissed in the opening six domestic matches of the season - as many as in their previous 73 outings.