Eric Cantona has admitted that he would have immediately ruled out doing one thing that fellow Manchester United legend Cristiano Ronaldo did in his playing career. The 57-year-old stunned the world in 1997 with his sudden retirement from football, with Eric Cantona only 30 years old at the time that he hung up his boots. Cantona, who was replaced as United captain by Roy Keane, had a legendary impact at Old Trafford after he was snapped up from Leeds United in 1992 for £1m. The prolific Frenchman was a larger-than-life figure at Old Trafford and adored by Manchester United fans, with Cantona …