One of the biggest fights between the clubs erupted this week after Porto targeted Manchester City in a bulletin for their fans following their 0-0 draw with Pep Guardiola’s men midweek.
In a puzzling 529-word speech, the Portuguese squad criticized players City and Guardiola for their playing habit as they celebrated their qualification for Champions League knockouts after completing a moment behind them in Group C.
His resolve to take this dramatic step in public denunciation raised some eyebrows and led the City to fight back after his surprising words.
But where does this verbal argument come from and why is there discomfort between the two parties? Sportsmail answers the key questions in this dispute.
A strange rivalry develops between Porto and Man City after their clash this week
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