What happened: Scotland midfielder Billy Gilmour has been ruled out of the World Cup after picking up a knock in Saturday's friendly win over Curaçao at Hampden Park. The injury was sustained during the match, and Yahoo Soccer reported the midfielder will miss the tournament.

Why it matters: Gilmour has been a regular in Scotland's midfield, and losing him on the eve of the World Cup thins the squad's depth in a critical area. The timing leaves little room for the staff to integrate a replacement before the tournament opens.

What to watch: Watch for the severity and expected recovery timeline of the injury, and whether Scotland call up a replacement midfielder to the World Cup squad.