Disaster Index: 5.4 Entry: Dual Attrition, Pre-Camp Cause: Kieran Tierney and Kenny McLean withdrawn from the Nations League squad before camp opens, requiring emergency call-up of uncapped Blackburn Rovers midfielder Kristi Montgomery. Category: Structural Evidence: Tierney's international availability has been interrupted repeatedly across the preceding campaign cycle. McLean, a senior midfield presence, drops out alongside him. Montgomery earns a first call-up by necessity as much as merit — the distinction matters to the Index even if it does not diminish her. Historical precedent: Scotland squads have a documented pattern of pre-camp attrition concentrating in positions that cannot easily absorb it. Tierney's absences in particular have become a recurring Index entry rather than an isolated event. Affected parties: Scotland head coach; midfield and defensive balance across the Nations League window; Montgomery, whose debut context is now shaped by circumstances outside her control. Immediate outlook: The squad adapts. The Index notes that adaptation has been required before the first session. Filed: 21 September 2026 / Nations League camp