Betfred Cup showdown. Andrew Dallas was poised to be the man in the middle but has been forced into a late withdrawal through injury.Dickinson, who was originally appointed as fourth official, will now take over from the injured whistler.It's a huge turn of events for the rookie whistler, who has taken charge of mainly League One and Two clashes this season.Rangers visit Paisley to face the Buddies for a place in the last four draw, set to take place later on Wednesday night.