And while that booking came in the cup, it still counts alongside Premier League games and means Guardiola will be absent from the touchline when the Blues welcome Leicester City to the Etihad on Wednesday.
Guardiola’s first booking of the season came in the dramatic 2-2 draw with Arsenal at the Etihad in September after he entered the field of play after John Stones’ 97th minute equaliser.
His second was for sarcastically applauding the referee for a 93rd minute caution of goalkeeper Ederson for time-wasting in the win over Fulham in October.
Since then, he has managed to avoid a third yellow card which would trigger a one-match touchline ban, but that luck finally ran out this weekend.
Unlike rules for players, there is no cut-off for bookings before managers receive a ban, meaning a manager could be at risk of a suspension for three bookings right up until the penultimate fixture of the season.
Guardiola will next be at risk of a touchline ban when he accumulates eight yellow cards, or if he is given a straight red card by the referee.
Managers can also be sent off for two yellow cards in the same game.
In other news…
The draw for the FA Cup semi-final has been conducted.
It took place after Aston Villa thrashed Preston North End 3-0 in the third quarter-final clash.
Marcus Rashford scored twice – his first goals for Villa – as they booked their spot in the last four.
Unai Emery’s men will now take on Crystal Palace at Wembley.
Yesterday, Palace hammered fellow Premier League side Fulham 3-0 at Craven Cottage.
Also on Saturday, Nottingham Forest needed penalties to see off Brighton. The game ended 0-0 after 120 minutes.
Forest have now been drawn to play the winner of the last quarter-final tie between Manchester City and Bournemouth.