In the early kick-off at BT Murrayfield, the man in the middle for the Jambos’ clash with holders Celtic will be Willie Collum. He will be assisted by Graeme Stewart and Alan Mulvanny, while Nick Walsh is on fourth official duties.
John Beaton will take charge of the clash between Aberdeen and Rangers at Hampden, backed up by Douglas Ross and Dougie Potter. The fourth official for the second semi-final of the day is Steven MacLean.
Collum has taken charge of 56 Celtic matches during his career, with the Hoops winning 41, drawing six and losing nine.
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He has shown 81 yellow cards and four reds in that time, and awarded 16 penalties.
Although he’s refereed fewer games involving Hearts - 49 - he’s shown 98 yellow cards and sent off ten, while awarding ten penalties.
Beaton has been the man in the middle for 24 Aberdeen games, of which the Dons have win 14, drawn three and lost seven. He has booked 44 players, sent off three and awarded thre penalties.
The 36-year-old has taken charge of 19 Rangers matches and has overseen 12 Gers wins, two draws and five defeats, showing 32 yellow cards, one red and awarding four penalties.