"Following the hearing today, I have instructed my legal team with immediate effect to inform the courts we will be appealing", Maguire said in a statement.
Maguire, 27, was arrested last week along with his brother and a friend after engaging in a physical altercation with another group outside a nightclub, claiming that he had intervened after his sister had been injected with an unknown substance by a group of Albanian men.
Maguire, who did not attend the hearing on the Greek island of Syros, released a statement saying he meant to appeal the verdict.
Maguire pleaded not guilty to the charges.
"The appeal has been accepted and will lead to a full retrial in a more senior court. Accordingly, he is not subject to any worldwide travel restrictions".
United's public support for the player is understood to be an indication that he will remain as club captain.
Maguire had been with a group of four men and three women leaving Bonbonniere bar in the Fabrika area of Mykonos following an all-day drinking session when trouble flared at around midnight on Thursday.
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According to Sky News, citing the prosecution, Maguire, who claims he is not guilty, arrived at the police station and tried to bribe the officers: "Do you know who I am?" The police officers were there for other duties and they heard a brawl.
"This is what I find quite shocking and quite unsporting".
Lawyer Dr Ioannis Paradissis said there was still time "to say sorry".
"It would be different because under Greek law you can withdraw some accusations - non-aggravated bodily harm and the verbal assaults that were shouted at the policeman".
Paradissis said this was "irrelevant" in respect of the assault on the officers and that it was "strange" that Maguire's sister had not mentioned this when she was interviewed by police. The police officers were there for other duties and they heard a brawl. They said "We're police, stop fighting". They've shown, playing in big matches at big clubs that they're talented boys.
Alex Bomberg, the chief executive of security firm Intelligent Protection International, said the United captain's arrest and subsequent conviction was "entirely avoidable" if clubs listened to his repeated warnings about footballers being sitting ducks while in public.
Project manager Daniel Johnston told AFP: "I think it's a load of rubbish". And in these instances, I think you can only make decisions on facts that you're aware of.
Maguire's younger brother Laurence tweeted on Wednesday to say there was "no chance" his sibling would apologise.