England, Wales, Northern Ireland and the Republic of Ireland have all secured their progress from the group stages of Euro 2016.
Here, Press Association Sport looks at who the four teams must now face in the last 16.
ENGLAND v Iceland
For a while on Wednesday night it looked like England would be pitted against Portugal, their penalty shoot-out nemeses at both Euro 2004 and the 2006 World Cup. But perhaps Roy Hodgson's men should be more worried about their actual opponents, Iceland, who booked second place in Group F thanks to Arnor Traustason's dramatic late winner against Austria. Unbeaten in their three pool games, the islanders are now entering uncharted territory but will pose England a threat with their speedy counter-attacking play and never-say-die mentality. Swansea man Gylfi Sigurdsson is a potent force in dead-ball situations.
WALES v NORTHERN IRELAND
At least one of the home nations will contest a quarter-final at this year's European Championship. That was the outcome engineered by Wales' domination of Group B - where they finished above England - and Northern Ireland's determination to claw their way out of a pool containing world champions Germany. With three goals already, Gareth Bale is the man Northern Ireland will fear, while Michael O'Neill's men will need another classy performance from midfielder Steven Davis when the nations clash in Paris on Saturday. And for the Green and White Army, they will be hoping Will Grigg will pick the right moment to catch fire.
REPUBLIC OF IRELAND v France
Ireland needed to secure an unexpected victory over confident Italy to hold any hope of reaching the knockout stages and, partly thanks to Antonio Conte's decision to field an understrength team, they pulled it off in Lille. Robbie Brady's late goal caused elation among the travelling fans, but the sobering reality of having to face in-form hosts France will soon start to loom large. Free-kick master Dimitri Payet has carried his scintillating West Ham form into the tournament and Les Bleus, protected by Tottenham goalkeeper Hugo Lloris, look strong at the back too. Ireland will also be out for revenge, seven years after Thierry Henry's controversial handling of the ball in Saint-Denis denied the Green Army a place at the 2010 World Cup.
Source: PA
