Sir Alex Ferguson 'could defy God', says Gordon Strachan Scotland manager Gordon Strachan says Sir Alex Ferguson is "the best psychologist in the world" and does not see an end in sight to the veteran Manchester United boss's career. How long will he go on for? Forever," said Strachan about his former manager at Aberdeen, Scotland and Old Trafford. He'll just get angry with God and defy him as well. Strachan was speaking as PFA Scotland launched its search for its manager of the year . Sir Bobby Charlton hails 'greatest manager there has ever been' But, for the Scotland manager, few will ever come close to matching the heights reached by his fellow Scotsman, the 71-year-old Ferguson. "I heard Sir Alex describe Ryan Giggs as a freak - he's in the same boat," said Strachan referring to the veteran Manchester United winger. But he's an even bigger freak because he is so good at his job. People keep telling me about sports psychologists and all the rest. That man is the best sports psychologist in the world. You only get these people once in a generation - he's the one. England manager Roy Hodgson also hailed Ferguson. "If we're talking about magic in football, the only magicians I know are people like Sir Alex," he said. United legend Sir Bobby Charlton labelled Ferguson's side as one of the best in the club's history. England World Cup winner Charlton has a close relationship with the long-serving Scot but said he did not know how long Ferguson intended to carry on for. He'll maybe tell me. But, at the end of the day, he is such a motivator. As soon as we won that match on Monday, his thoughts will have turned to next season.