But doubts about the Turkish city's ability to host the game were left in serious doubt after the UK placed the nation on its country's travel "red list".
This week, UEFA said it remained committed to playing the game in Istanbul, even though the country is under coronavirus lockdown until May 17.
Europe's chief governing body also said it intended to operate with limited number of fans in attendance at the Ataturk Stadium, but the new UK government rules mean City and Chelsea fans travelling for the game would have to quarantine in government-approved hotels when returning to the UK.
There had been different ideas that the UK was ready to step in to play host, although with Wembley also currently scheduled to hold the Championship play-off final the same day it remains to be seen if the national stadium is a viable alternative.
However, reports suggested the EFL is open to moving all three of its play-off finals to allow Wembley to host the Champions League final