He will be backed by a team of Scottish officials.
AR1: David McGeachie
AR2: Frankie Connor
Fourth Official: Dougie Potter
AAR2: Bobby Madden
AAR2: John Beaton
Refereeing
William Collum to take charge of Europa League semi-final
24 Apr 18
William Collum has been appointed to referee Thursday’s Europa League semi-final between Marseille and FC Salzburg.
![Image: William Collum to take charge of Europa League semi-final [Migrated]](https://images.ctfassets.net/qu0slcxvbwp6/6TD7VlokFoWJ9IOz369mWn/7b3a881df1f41bb517fb37ed51576a4c/willie-collum-2.jpg?fm=webp&fit=fill&f=face&w=1000&h=600)
![Image: Abbie Hendry and Olivia Crawford on hand to inspire referees. [Migrated]](https://images.ctfassets.net/qu0slcxvbwp6/2AdfV9GeGB7dvnpxmQFOeQ/1a9670d840c61f9f8d6d3de22c22e398/21620573-1.jpg?fm=webp&fit=fill&f=face&w=3280&h=2192)
![Image: FIFA International List for 2026 Confirmed [Migrated]](https://images.ctfassets.net/qu0slcxvbwp6/7zAGruzI7lhLIGV8y4l3Zw/ce93db56e4980a318cab72b68046767b/21541576.jpg?fm=webp&fit=fill&f=face&w=4676&h=2954)
![Image: Nick Walsh promoted to UEFA Elite Referee Category [Migrated]](https://images.ctfassets.net/qu0slcxvbwp6/1Aua4TpMEqTupgttrIii97/0f9c1a5c75ba1c29ae6fe140872f0db3/21543997.jpg?fm=webp&fit=fill&f=face&w=4208&h=2800)