He told AD Sportwereld: "Looking back he should never have become national team coach, he says now.
"He was too young for that task. But he was the national team coach. How many people can say that?
"Am I able to call Frank Rijkaard to become coach of FC Twente? Yes, I am, but we are on another track."
Munsterman dismissed the Dutch perception of McClaren as a typical English kick-and-rush coach, adding: "Quite to the contrary. You cannot say that Manchester United played lousy football, can you?
"He reformed the youth academy of Middlesbrough and formed a successful team with young players.
"In the UEFA Cup he was better than the AZ team of Louis van Gaal. McClaren is a man of football, who thinks continental and he does everything with the ball."