Celtic boss Gordon Strachan welcomed the decision by all 12 SPL managers not to publicly criticise referees. Strachan, however, denied he in particular would find that difficult.

"It has happened to us this season and we have managed to do it," Strachan said.

"If you look back at the Champions League, there was big decisions there and we had to deal with it.

"It's not easy - I understand where Craig Levein is coming from!

"I've been there myself but we think we should take the pressure off referees a bit.

"I've been to games, and I've heard people talking against us about referees, and they've missed the beauty of the game.

"They've missed the good goals and the good performances, because everybody talks about refereeing decisions.

"If we want to promote the game properly, we must promote good goals and good play and there has been a lot of that this season.

"Whether it works or not, I don't know, but it's worth a try."