City found Porto stopper Agustín Marchesín in fine form in the second half, but after making another stunning save, Jesus was on hand to steer home the rebound from his own header to seemingly give City a fifth win from five group games. 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.
City won its first four games in the group, and Guardiola is delighted with how the campaign has worked out with one match left. It said the Brazilian was "a clear example that football money counts a lot, but it doesn't buy class or notion".
The newsletter didn't stop there with the club also slandering Bernanrdo Silva.
This was a reference to a social media post by Silva past year in which he compared team-mate Benjamin Mendy to the character on a packet of Conguitos chocolates.
Silva deleted the post 46 minutes after he published it before tweeting: 'Can't even joke with a friend these days'.
However, Porto have dragged that up in the newsletter by describing him as someone "known internationally for having been convicted of racism". "In this context, this latest outburst it nearly as surprising as it is disappointing", City went onto add as they reminded Porto of the fine they were sentenced to after Porto's supporters had made racial chants towards City's players.
"After the scandals of the game in England, this time a penalty was missed for Ederson's more than obvious foul on Otavio".
But while Sergio Conceicao's Primeira Liga leaders certainly had lady luck on their side, they also had a defender who, at the Estadio do Dragao, performed as if his life depended on it.
He recalled that the Portuguese champions had given his side a stiff test and physical workout during the 3-1 win at Etihad Stadium in October, and perhaps with all that in mind the Catalan coach picked a strong attack featuring Raheem Sterling, Phil Foden and the in-form Ferran Torres, who was seeking his fourth successive goal in the competition.
The pair repeatedly clashed, with Guardiola accused of "speaking about our country using ugly words" during spats between the two benches. "It was hard to get up front as we wanted, much because of City, who react well when they lose the ball".
'The five years we are here - and before then in Germany or Spain - our behaviour speaks for itself'. It's not a part of who we are.