Jan Wouters is due to leave Rangers in the summer
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Rangers coach Jan Wouters claims Scottish referees let the "cloggers" get away with illegal challenges.
The Dutchman, who will leave Ibrox in the summer along with manager Alex McLeish, is critical of officials.
Wouters told The Sun: "I've seen fouls and things here you wouldn't believe and the referees don't even blow their whistle let alone give a red card.
"It's as if they have their own rules that are completely different from the rest of the world."
Former Holland World Cup star Wouters was brought to Ibrox by McLeish's predecessor, Dick Advocaat.
"Dado Prso has now adjusted to playing in Scotland, but he can't believe what he is still experiencing with blatant fouling and over-tolerant referees," he said.
"Other players had more trouble adjusting, like Thomas Buffel in the beginning, but he learned to use his superior technical ability to avoid the cloggers."