In February 2020, UEFA barred City from European competition for two years for violating its Financial Fair Play rules, but the Court of Arbitration for Sport eventually overturned the punishment.
The CAS determined that some of the charges against City were “not established” and others were time-barred.
Ceferin is still certain that his organisation was correct, telling the Daily Telegraph on Thursday: “We know we were right. We would not make a decision until we believed we were correct.”
The Slovenian’s comments came as City faced a Premier League tribunal after being accused with 115 violations of the domestic competition’s profit and sustainability criteria.
A furious Guardiola claimed that by stepping out now, Ceferin had disrespected City’s current Premier League negotiations.
“As the lawyer that he is, as president of UEFA, he should wait – and after do whatever he wants,” he told reporters on Thursday.
“He has to respect it and he has to wait. He has a lot of jobs to do at UEFA. A lawyer should respect the procedure. He knows we have the right to defend ourselves.”
City will again be without striker Erling Haaland for their FA Cup fourth tie at Tottenham on Friday.
But the Norway striker is nearing a return after almost two months out with a foot injury.
“He is on the verge of coming back. For Friday he is not ready but he is close,” Guardiola said.
“The training camp was good, he trained some sessions. The last few days he’s trained but it is not perfect and we will wait a little bit more.”
John Stones has returned to action following an ankle injury, but fellow defender Manuel Akanji remains out. Ederson, City’s goalkeeper, is also healthy after limping out in the club’s last game at Newcastle.
City have lost their last five visits to Tottenham Hotspur Stadium without scoring a single goal.
Guardiola urged the FA Cup holders to break their duck, saying, “That is the reality, (and shows) how difficult it is for us.”
“Of course this is a ‘final’, a knockout game and to go through we have to score goals. Always it is a new opportunity to break it.
“The feeling is most of the times we played really good but the reality is there, no goals, five defeats – so they were much better than us.”