Scot launches staunch defense of Manchester United . Former Louis van Gaal boss is regarded as one of the best managers in world football . United have struggled since the Scot left in two decades . The Scot , one of British football 's most successful leaders , has been criticized in recent months following Manchester United 's dramatic downturn in form since his departure . Manchester United charged with restoring club 's fortunes .
Scot launches staunch defense of Manchester United . Former Louis van Gaal boss is regarded as one of the best managers in world football . United have struggled since the Scot left in two decades . Manchester United charged with restoring club 's fortunes .