When the qualifying draw was made in December, there was an understandable assumption that Germany would top the group and seal automatic qualification with Northern Ireland, Slovakia and Luxembourg fighting among themselves for the play-off spot afforded to the runner-up.

Slovakia’s victory over the four-time World Cup winners to kick things off last month has instead opened up myriad possibilities.

Friday night’s visitors to Windsor Park, who followed up their shock result against the Germans with late victory in Luxembourg, know that another three points in Belfast would be a huge step towards booking their place at next summer’s World Cup in the USA, Canada and Mexico.

While the side ranked 42nd in the world did not make the tournament in 2022, they reached the European Championships either side and were beaten by England at the last-16 stage in 2024 only after Jude Bellingham’s spectacular 96th-minute overhead kick.

Manager Francesco Calzona is the first foreign boss in the country’s history and came recommended by Slovakian legend Marek Hamsik from their time together at Napoli, where the Italian was an assistant coach.

Ties to the Serie A champions do not stop there with midfielder Stanislav Lobotka the side’s key player. The 30-year-old, however, has emerged as a major injury doubt for the game on Friday.

Another with recent Champions League experience, Atletico Madrid full back David Hancko, is another who could miss out.

While O’Neill said he would not believe their absences until the pair were missing when the anthems are played at Windsor Park, should Slovakia be without both then Middlesbrough striker David Strelec will be expected to carry a greater load.

The performances of 19-year-old Feyenoord winger Leo Sauer for the national side have sparked excitement too.