England did not contest the forward's dismissal for a dangerous tackle in Saturday's 14-man demolition of Argentina when the Sale openside appeared before a brief virtual hearing on Tuesday.
After the disruption caused to their World Cup preparations by the Owen Farrell and Billy Vunipola incidents last month, England are keen to focus all their attention on Sunday's Pool D showdown with Japan.
And while continuing to hone their tackle technique in training, defence coach Sinfield is satisfied there is no deeprooted problem.
"Discipline-wise, we gave away seven penalties at the weekend," Sinfield said.
"I don't think we've got a discipline problem, I thought it was really unfortunate what happened at the weekend. It's been different from the other challenges that have taken place.
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