Friendships will be put on ice tomorrow night for a good old-fashioned international derby.
Reigning European champions England swagger into Dublin for a Euro 2025 qualifier date with the Republic of Ireland, minnows in a group of giants.
If familiarity breeds contempt, expect this one to have a real edge. There's a bundle of ties between the two sides, with several of the players either clubmates, former clubmates, or - in the case of Aoife Mannion, Emily Murphy and Anna Patten - ex-international teammates.
The trio represented England at underage level before switching allegiance to Ireland.
They all started in Friday night's 1-0 loss to France in Metz, and their potential presence for the visit of Sarina Wiegman's team adds another layer of intrigue.
New faces, new dynamics, but for Megan Campbell, the fundamentals remain the same.
"We haven’t played each other on the biggest stage for a long, long time, so this is something we will relish, but we have to focus on just the football because ultimately it’s just another game for us," said the experienced defender, who came off the bench in Metz to make her first Ireland appearance in 14 months.
"We have to keep that mentality going in to it, stay positive and confident. We can get something from Tuesday night. We have to be hard to beat."
Friends become foes in the heat of battle, with Campbell admitting there's been some gentle needling in the build-up.
"Some of them are really good friends of mine, like Chloe Kelly who I speak to quite a bit (they were team-mates at Manchester City for one season).
"I know all the girls from playing for a few different clubs around the WSL and now in the Championship, so it'll be nice to see them. But hopefully it’ll be nicer at the end when hopefully the result will be maybe in our favour.
"You're friends off the pitch, but when it comes to game time and you cross the white line, it’s football. We’ll do all we can to get that result."
Campbell did well as a second-half substitute against the swashbuckling French. She offered some poise and aggression on a tough night for the visitors, who spent most of the contest desperately trying to put out fires as Herve Renard's charges attacked unrelentingly.
The Drogheda native also used her trademak throw to take the pressure off - a powerful slingshot that forced France into a few retreats.
"I wish one of them had gone in, but it's something that maybe we can practice a little bit more in training," she said.
"Anything that goes in to the box is a threat when we have people who are very dangerous aerially.
"I think we have to be realistic, we have to play to our strengths. Ultimately we’re hard to break down, we’re a great team defensively, we pride ourselves on that, we’ll absolutely give it everything we have.
"We have quality on the ball, we’re not saying we only have that defensive side, that we can only play for set-pieces, no, definitely not. We can play football and we need to be confident in that and brave enough to go out there and play. It’s about building on that confidence ultimately."
Onto England then, and a chance to genuinely blow the group wide open. If Ireland were to win it would go down as one of the country's greatest ever results in tournament qualification.
It's another massive ask, but Campbell is ready to embrace it.
"You're back in the Aviva in front of your home crowd, playing against England, we haven’t played them in a long time, so I think it’s going to be a great occasion for the fans.
"But for us ultimately it’s heads down, focus, recover now, and get ready. See how we can pose a threat against them and get something from the game. We have to be positive."
Watch Republic of Ireland v England in Euro 2025 qualifying on Tuesday from 7pm on RTÉ2 and RTÉ Player, follow a live blog on rte.ie/sport and the RTÉ News app and listen to commentary on 2fm's Game On
