The Scottish Football Association has hit out at a group representing the country's match officials after they released a statement on Wednesday.
Celtic will host Aberdeen in the fifth round of the Scottish Cup in what is the only confirmed all-Scottish Premiership tie so far.
Defender Andrew Robertson's double helped Dundee United knock Kilmarnock out of the Scottish Cup after a 5-2 fourth-round win at Tannadice in front of 6,979.
Kilmarnock will be without James Fowler and Michael Gardyne for their William Hill Scottish Cup tie against Dundee United on Friday evening.
Dundee United forward Nadir Ciftci has signed a one-year contract extension.
Dundee United boss Jackie McNamara is hoping youngster Ryan Gauld has not
Ryan Gauld set up all four goals as Dundee United recorded a comprehensive 4-1 victory over nine-man Partick Thistle to condemn the away side to their third consecutive defeat in the Scottish Premiership.
Partick Thistle boss Alan Archibald is without suspended duo Stephen O'Donnell and Gary Fraser for Saturday's clash with Dundee United.