Uefa will support president Michel Platini through an appeal against his eight-year ban, the organisation has said.
In a statement, the body - which represents football associations across Europe - said it was "disappointed" with the decision by Fifa's Ethics Committee to ban and fine Mr Platini.
Uefa has taken note of the decision of the Fifa Ethics Committee to suspend Michel Platini for eight years from all football-related activities.
Naturally, Uefa is extremely disappointed with this decision, which nevertheless is subject to appeal.
Once again, Uefa supports Michel Platini's right to a due process and the opportunity to clear his name.
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Outgoing Fifa president Sepp Blatter has vowed to "fight" after being hit with an eight-year ban from football.
"Suspended for eight years - suspended for what?" he demanded, speaking at a press conference in Zurich following the decision of the Independent Ethics Committee.
He confirmed he plans to take his objections to Fifa's appeals body, go before the Lausanne-based sports arbitration panel, or take legal action under Swiss law if needed.
He said he had served with "heart and conscience" for more than 40 years, and criticised the committee for its handling of the investigation, saying he felt he had been "betrayed".
"I am a man of principles, and these principles are: Never take money you have not earned; secondly, pay your debts - but now they are telling me that I tried to buy votes through Michel Platini votes for the 2011 elections," he added.
Outgoing Fifa president Sepp Blatter has said he is being treated as a "punching ball", after being banned from all football-related activities for eight years.
"To say that it's a good day for me or for Fifa would be totally wrong," he said.
He defended a £1.3 million payment he made to Uefa president Michel Platini, saying it had been part of an oral contract - or "gentleman's agreement" - for his work for Fifa.
He accused the Ethics Committee of ignoring evidence of the agreement.
"I'm sorry that I'm still a punching ball - and I'm sorry for football," he said.
Blatter: I'm really sorry, I'm sorry that I'm still a punching ball. I'm sorry for football.... but I'm sorry about me. How I'm treated ..
Outgoing Fifa president Sepp Blatter has arrived at a press conference after being slapped with an eight-year ban by the footballing body's ethics committee.
Sporting a plaster on his face, Mr Blatter refused to answer questions from the crowd of journalists as he made his way into the building in Zurich.
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Sepp Blatter has written to Fifa's 209 member associations protesting his innocence and criticising Fifa's ethics committee ahead of disciplinary hearings later this week.
The 79-year-old outgoing Fifa president claims the proceedings against him have been "like an inquisition".
Blatter and Uefa president Michel Platini will have hearings before Fifa ethics judge Hans-Joachim Eckert on Thursday and Friday in Zurich over a £1.3million payment made to Platini by FIFA in 2011.
Blatter's personal advisor Klaus Stoehlker told Press Association Sport that Blatter had written to all 209 FIFA associations.
Stoehlker said Blatter had been working on the letter on Monday and had sent it to the 209 associations because he wanted to tell them in person of his feelings about the charges.
"He has worked very hard on this letter, he is looking at this week feeling very strong in spirit," said Stoehlker.
Suspended Fifa president Sepp Blatter suffered a "medical incident" at the weekend, Swiss radio has reported.
According to sources speaking to the station, Blatter - who was provisionally banned from football for 90 days last month amid allegations of corruption - will have to undergo medical checks over the next 10 days.
Reuters news agency reported a spokesman that Blatter was under evaluation for stress, and that he was not in hospital.
And a spokesman told ITV News his condition is "nothing too serious", adding: "He has just been under a great deal of pressure recently."
He said he was "optimistic" Blatter's condition would improve, and he is expected to be back at work at the start of next week after a few days off.
Fifa has confirmed German World Cup winner Franz Beckenbauer and vice president Angel Maria Villar Llona are both subject to investigations by the organisation's ethics committee.
Beckenbauer was a Fifa voter when Russia and Qatar were chosen to host the 2018 and 2022 World Cups respectively, while Villar Llona has sat as vice president on Fifa's executive committee since 1998.
The investigations into both men have been completed and are now awaiting verdict.
A Fifa statement read: "Proceedings relating to the two officials Angel Maria Villar Llona and Franz Beckenbauer have already been passed on to the adjudicatory chamber."