The four League C sides—Iceland, Bulgaria, Estonia, and Luxembourg—enter the 2026-27 Nations League group phase with closely matched records and limited recent separation in form. All four struggled in 2026 World Cup qualifying, posting similar win rates and goal differentials against stronger opposition, while their FIFA rankings sit within a narrow band that underscores comparable squad depth and experience. The double round-robin format, beginning with Matchday 1 fixtures on 26 September, places heavy emphasis on home results and short-turnaround recovery, factors that historically flatten differences among these teams. Trader consensus reflects this parity, with implied probabilities clustered tightly because no side has demonstrated sustained momentum or roster advantages capable of breaking the deadlock before the November conclusion.