Manchester City confirmed Friday they had launched an appeal against a damning judgement that found the club guilty of all charges related to serious breaches of the Premier League's financial rules.
An independent commission delivered its findings on the club earlier this week and City had until Friday to appeal.
The Premier League leaders announced shortly before midday (1000 GMT) they had done so.
No sanction has yet been decided upon but City could face substantial points deductions, a fine or even expulsion from the top division.
The 10-time English champions, who continue to deny any wrongdoing, said Friday they had lodged a "comprehensive appeal" the previous evening.
"The club's firm position is that, on multiple grounds, the opinion contains clear material errors, of law, principle and fact and is unsafe," City said in a statement.
"The club is innocent of the accusations made by the Premier League and a comprehensive body of irrefutable evidence exists in support of all of its positions, relating to this case.
"We will continue to respect due process and are necessarily restricted in what we can say further until all proceedings are complete."
Earlier on Friday, the English Football Association broke its silence on the case, saying that the commission's decision "has significant implications for the integrity of the game".
"We are carefully considering the decision and its implications and will take action where appropriate," the national governing body said in a statement.
