According to the well-informed Gerard Romero of RAC1, Suarez will not be able to achieve dual Italian nationality before October 6.
Suarez would have to get an Italian passport in order to be registered for the Champions League by Juve.
☎️ LUIS SUAREZ
Descarta la JUVENTUS ❌
La doble nacionalidad no llegaría antes del 6 de octubre y le impide jugar la fase de grupos de la Champions ( día para presentar la lista)
— Gerard Romero (@gerardromero) September 15, 2020
Juventus will now have to turn to other names on their list, with Roma’s Edin Dzeko one of those.
As for Suarez, he has other options on the table to leave Barcelona before the transfer window shuts.