Every person who watches Football is allowed their opinion what ever it may be,But to brazenly come out and say "the man's clueless" or "doesn't know what he's doing" when the chap has played at the highest level,won titles,European cups is folly.
It's like him coming into your workplace and taking to Facebook and saying you are crap at your job!! Am not saying don't debate or air opinions or views but at least think about what saying and try and back it up.Imagine the likes of Dave Kelly standing in front of Koeman going "err sorry Ron but you haven't got a clue".