GLASGOW, SCOTLAND - DECEMBER 15: Roy Keane poses with his new shirt at a press conference to announce his signing for Glasgow Celtic on December 15, 2005 in Glasgow, Scotland. (Photo by Alan Peebles/Getty Images)
GLASGOW, SCOTLAND - DECEMBER 15: Roy Keane poses with his new shirt at a press conference to announce his signing for Glasgow Celtic on December 15, 2005 in Glasgow, Scotland. (Photo by Alan Peebles/Getty Images)