England, Scotland, Wales and the Republic of Ireland enter Euro 2028 qualifying as co-hosts with a UEFA safety net of two reserved spots for the highest-ranked among them that miss the 20 automatic berths. Northern Ireland, no longer a host after withdrawing from venue plans, must qualify on merit in the standard 12-group format starting March 2027. Recent Nations League and ranking data show the four hosts with strong implied qualification probabilities near 93 percent, while Northern Ireland sits near 48 percent, creating the close market balance. Key upcoming factors include the December 2026 qualifying draw, group compositions, and each side's form through the 2026-27 campaign that could shift Northern Ireland's odds or test the hosts' resilience in separate groups.