Northern Ireland were the only team in the 2026-27 Uefa Nations League yet to concede a goal following Saturday's result in Derry City and Strabane District Council.
Switzerland equalised in the 11th minute of their 2-1 win over Slovakia, leaving the Irish side as the sole group without having allowed a goal.
Across the current campaign and the previous season when Northern Ireland competed in League C, they have recorded seven clean sheets from nine matches, conceding just three goals overall.
The manager's side secured three consecutive scoreless results upon returning to the second tier, including draws against Georgia and Ukraine with a nil-nil draw against Hungary separating them.
A match against Georgia in Belfast on Monday night would see Northern Ireland extend their longest streak of clean sheets in nine years.
In the reverse fixture in Tbilisi, goalkeeper Pierce Charles made a crucial save from Paris St-Germain forward Khvicha Kvaratskhelia during a player of the match performance.
The Queens Park Rangers loanee had limited involvement in the two games since despite the absence of Daniel Ballard and Conor Bradley through injury.