Slovakia have sacked manager Pavel Hapal just five days after beating the Republic of Ireland in Sunday's Euro 2020 play-off semi-final.
Hapal led Slovakia to the final after defeating Stephen Kenny's side on penalties in Bratislava.
Northern Ireland are set to host the decider on 12 November at Windsor Park for a spot at the Euro 2020 finals.
The former Czech Republic striker missed Wednesday's defeat by Israel after testing positive for Covid-19.
Despite the victory over the Republic, Slovakia are winless in their four Nations League matches, with their only point coming against Israel in September.
A loss away to Scotland and a late 3-2 defeat at home to Israel were the final straw for the Slovakian FA, which has dismissed Hapal and his assistant Otto Brunegraf.