Stewart Regan, Scottish FA chief executive:

“I can confirm that I have met with the relevant match officials and members of the referee departments regarding the events that occurred during the recent Clydesdale Bank Premier League match between Dundee United and Celtic.

“I can also confirm that Steven Craven has tendered his resignation and will no longer officiate in the professional game. I hope to conclude the investigation within the next 48 hours and will make further comment at that time.”