Hearts and Hibs find out Betfred Cup semi-final referees
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Bobby Madden will take charge of Saturday's match between Hibs and Celtic.
This will be the second time that each side have encountered the whistler this season. Madden was in the centre as Celtic defeated arch-rivals Rangers at Ibrox in early September, while Hibs haven't encountered the 41-year-old since beating Arbroath in the Betfred Cup group stages.
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Hide AdThe referee for Sunday's match between Rangers and Hearts will be John Beaton.
The official was in charge when Rangers lost to Aberdeen in last season's semi-final at Hampden.
He was also the referee when Hearts bettered Hibs at Easter Road earlier this campaign.