Willie Collum has been INJURED in the warm-up and will NOT be in charge of today's game at Hamdpen.
Rangers and Celtic battle it out for a place in the Scottish Cup Final this afternoon at the national stadium but a late change has been made on the official front. Don Robertson - who was down as the fourth official - will step up and take charge of the game after the whistler suffered a calf strain while going through his pre-match routine in Mount Florida.
Viaplay Sport coverage of the game broke the news pre-match, they announced: "We are always first with team news on Viaplay Sport and we've got some more breaking news coming to you from this game.
READ MORE: We simulated Rangers vs Celtic to get a score prediction for Scottish Cup semi-final
"Willie Collum is no longer the referee in this one. He has been injured in the warm-up with a calf strain so Don Robertson who was the fourth official is now taking charge."
READ NEXT:
- Kieran Dowell 'passes' Rangers medical with three-year deal 'agreed' for Ibrox free transfer
- Rangers 'set' to revisit Morgan Whittaker transfer with Michael Beale ready to launch fresh move
