Republic of Ireland defender Ciaran Clark was attacked and hospitalised while on holiday in Spain.
The 28-year-old Newcastle defender suffered cuts and bruises to his face after an altercation in a bar in Magaluf, Mallorca in the early hours of Sunday morning, the BBC has reported.
A British man was arrested for punching the former Aston Villa man, who was knocked unconscious, according to reports.
Clark has 29 Ireland caps.
The FAI and Newcastle United have been contacted for comment.