Sir Alex Ferguson labelled him the best he ever worked with, aspiring footballers and Reds everywhere worshipped the ground he walked on: Roy Keane epitomised the unwavering spirit and desire to succeed that Manchester United stands for. Few sportsmen lead from the front the way Keane did, on and off the pitch – and the fact that more than 70,000 United and Celtic fans paid their tributes to him at his testimonial before he retired in June 2006 says it all.