Willie Collum OUT of Rangers vs Celtic as Don Robertson a last minute call-up

Don Robertson has replaced Willie Collum as referee for today's Scottish Cup semi-final between Rangers and Celtic.

The whistler pulled up injured during the warm-up with fourth official Robertson given the responsibility of officiating the big one at Hampden Park this afternoon. It will be his first match as referee between the two sides. John Beaton will now be on the sidelines as the fourth official today following the late substitution. Celtic are looking to keep their Treble hopes alive today as they take on Michael Beale's Rangers side who are in a make or break scenario. Daniel McFarlane and Dougie Potter are running the lines at the national stadium with Steven McLean at Clydesdale House for VAR.

The winner of today's semi-final will take on Inverness Caley Thistle at the national stadium on June 3 after Billy Dodds' side eased past John McGlynn's Falkirk side 3-0. A double from Billy McKay and a first half header from Daniel Mackay was enough to put the Highlanders into the showpiece.

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