Among the contenders to be chosen as host cities are Belfast, Birmingham, Cardiff, Dublin, Glasgow, Liverpool, London, Manchester, and Newcastle.
If Italy and Turkey both have to supply just five stadiums, UEFA wins control over the organisation even though its own bid regulations stipulate that only nearby member federations may propose co-hosting.
Travelling by air takes more than two hours, and the distance between Rome and Istanbul is approximately 1,400 kilometres (870 miles) across the Mediterranean and Aegean seas.
While Turkey and Italy will both automatically qualify as hosts for Euro 2032, UEFA will not grant the 2028 hosts five automatic spots. One possibility is to place all five in conventional qualifying groups and give the automatic spots to the non-qualifiers with the two best records.