Northern Ireland were undone by a superb Michael Olise hattrick as France jetted off to the World Cup with a 3-1 friendly win, but another spirited performance from Michael O'Neill's young side was rewarded with Patrick Kelly's first international goal.

Olise struck either side of half-time, both goals unerring finishes on the rebound, and after Kelly pulled one back the Bayern Munich man delivered a superb curling strike to settle it in the 75th minute.

But France, among the favourites to lift the World Cup this summer, hardly had things all their own way as Northern Ireland -- whose starting XI had an average age of just 22.6 -- dug in to produce another determined display showing maturity beyond their years.

And that was rewarded in the 64th minute when Kelly, the 21-year-old making only his second international start, turned in a Shea Charles cross, silencing the crowd to deliver on O'Neill's plea for his players to act as "badly-behaved guests" at France's going-away party.