The Gaoth Dobhair player pleaded guilty to threatening unlawful violence when he appeared at Letterkenny Circuit Court today.
Cassidy, 30, of Cotteen, Derrybeg appeared wearing suit trousers and a dark jumper.
He pleaded guilty to the charge.
He is a teacher at a special needs school in Letterkenny and is a fluent Irish speaker.
Cassidy’s brother Stephen, 37, of Upper Brinaleck, Gweedore also appeared in court charged with assault causing harm.
He also pleaded guilty to the charge.
The incident happened on the evening of August 24th, 2008 at Ard na gCeapairi, Derrybeg, Gweedore.
Two other brothers also appeared in court charged with offences related to the same incident.
Shaun Maguire, 28, of Ardsbeg, Gortahork pleaded guilty to engaging in threatening behaviour in a public place.
His brother Michael, 21, of Ardsbeg, Gortahork pleaded guilty to causing an affray in a public place with threatening behaviour.
Judge John O’Hagan adjourned the case until July and said the issue of community service should be considered.
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