Pep Guardiola criticised Kyle Walker after the full-back was shown a potentially costly red card in Manchester City's Champions League defeat at RB Leipzig.
The England defender was sent off for a needless hack at the legs of Leipzig goalscorer Andre Silva after 82 minutes of City's 2-1 loss behind closed doors at the RB Arena.
With top spot in Group A already assured, City had little to play for in their final match of the first phase but the suspension that will now follow for Walker could have repercussions in the next round.