Man City have been banned from the Champions League for two years by UEFA for “serious breaches” of their Financial Fair Play rules.
They were also fined 30 million euros. Man City will appeal to the Court of Arbitration for Sport.
Manchester City said in a statement: "The club has always anticipated the ultimate need to seek out an independent body and process to impartially consider the comprehensive body of irrefutable evidence in support of its position.
"In December 2018, the Uefa chief investigator publicly previewed the outcome and sanction he intended to be delivered to Manchester City, before any investigation had even begun.
"The subsequent flawed and consistently leaked Uefa process he oversaw has meant that there was little doubt in the result that he would deliver. The club has formally complained to the Uefa disciplinary body, a complaint which was validated by a CAS ruling.
"Simply put, this is a case initiated by Uefa, prosecuted by Uefa and judged by Uefa. With this prejudicial process now over, the club will pursue an impartial judgment as quickly as possible and will therefore, in the first instance, commence proceedings with the Court of Arbitration for Sport at the earliest opportunity."
They face Real Madrid in the last 16 of this year’s competition.