At the South Belfast site, the Northern Ireland women's football team's match against Montenegro, the vice president of Sinn Féin stood for God Save the King.

Ms O'Neill was met by IFA President Conrad Kirkwood and CEO Patrick Nelson when she and DUP Deputy First Minister Emma Little-Pengelly arrived at the stadium.

The GAA's new president Jarlath Burns, Stormont junior ministers Aisling O'Reilly from Sinn Féin and DUP's Pam Cameron, and DUP communities minister Gordon Lyons were also present at the stadium on Tuesday.

Prior to the UEFA Women's Nations League play-off, Ms. O'Neill told reporters, “It's great to be here this evening.”

“Today, Aisling, Emma, Pam, and I all said that the ladies are here to help other women.

“Excited for the game, it's going to be a fantastic night. We've all brought our layers to be bundled up.”

“I believe it's critical that we all stand behind and support them, especially the women that participate in sports. I'm thrilled to be here, and I think tonight is going to be a great night.”

"We're all really, really supportive of our women in Northern Ireland football, so it's really good that we're all here this evening to support them," Ms. Little-Pengelly stated.

“We really hope they succeed, but they've been outstanding representatives of Northern Ireland, and I have no doubt that they will stay that way.”

Windsor Park has historically been linked to the unionist population in the area, and in the past, episodes of sectarianism at international games have caused issues for the Northern Ireland football authority.

As a “First Minister for all,” Ms. O'Neill has pledged time and time again to stand out for all the communities in the area.

When serving as Deputy First Minister in 2016, the late Martin McGuinness went to a Northern Ireland match in France as part of the European Championships event.

Caral Ni Chuilin, the sports minister for Stormont at the time, was the first senior Sinn Féin member to attend a Northern Ireland match at Windsor Park back in 2011.