What happened: Fans attending Manchester United's Dublin friendly drew criticism from domestic-league supporters, renewing debate over local loyalties. The match took place Wednesday at Croke Park.
Why it matters: The dispute taps a long-running fault line in Irish football: support for major English clubs versus attendance in the domestic league. A one-off preseason event at the country's largest stadium put that divide on a national stage.
By the numbers: Croke Park lists its capacity at 82,300; 17 years separated the 2009 fixture from Wednesday's return of association football.
What to watch: Domestic attendance will show whether the discussion carries beyond the friendly.