Roy Keane has completed his move to Celtic after signing an 18-month deal.
Keane, who ended his Manchester United career last month by `mutual consent', was linked with Real Madrid earlier this week.
But, when the Spanish giants cooled their interest in the 34-year-old Irishman, Celtic seized their chance.
Keane's deal is believed to be worth £40,000 a week, with Parkhead majority shareholder Dermot Desmond reported to be paying for half of it.
The midfielder will be eligible to make his Hoops debut against Hearts in the Bank of Scotland Premier League at Tynecastle on New Year's Day.