**Spain's formal bid submission in late September 2026, proposing the renovated Santiago Bernabéu for the final and José Zorrilla in Valladolid for the other semi-final, has positioned the country as a frontrunner among League A sides with suitable Category 4 venues.** The host selection process favors one of the four quarter-final winners advancing from the ongoing 2026-27 league phase (through November), with UEFA's Executive Committee appointing the pair after the March 2027 ties. Multiple associations, including England, France, Germany, Italy, Portugal, Croatia, and others like Greece exploring options, have registered interest or meet stadium criteria, creating broad uncertainty. Trader consensus reflected in the bunched probabilities underscores the tight race driven by qualification variability, recent form in League A groups, and the preference for a participating nation over neutral hosts. Bids close October 21, 2026, with the final decision expected by December.