Porto have sensationally released a newsletter slamming Manchester City as the war of words now extends to beyond their two managers.
City were held to a goalless draw in Portugal - a result that confirmed their place in the last 16 of the competition as group winners. It also guaranteed Porto's place in the next round as runners-up too.
However, the two group fixtures between the pair have been tetchy affairs and the animosity has only developed following Tuesday night's stalemate.
The Portuguese giants have blasted City midfielder Fernandinho for lacking 'class or insight' while Bernardo Silva and Pep Guardiola are also in the firing line.