England face Iceland in the last 16 of Euro 2016 on Monday night in Nice.
The winner of the match at the Allianz Riviera stadium will face hosts France, who beat the Republic of Ireland on Sunday.
Fans have been gathering in the city ahead of the match, including British World Heavyweight champion Tyson Fury.
England manager Roy Hodgson said: "It's win or lose. We'll be trying our very best to win because we want to stay in the tournament."
British World Heavyweight champion Tyson Fury was mobbed by England fans as he made a surprise appearance on the French Riviera on Sunday.
England fans have been gathering in the French city of Nice ahead of their Euro 2016 Last-16 showdown with Iceland on Monday.
The boxer was mobbed as he entered the Akathor bar in the Vieille Ville area, and posed for selfies with fans as he made his way along the Rue Saint-Francois de Paule.
Fury put on a Three Lions shirt and posted a receipt for 1,000 Euro on Twitter, saying: "This is how much I love my fans, euro 2016, 200 Jager bombs, for the the fans."
France came back from a goal down to beat the Republic of Ireland 2-1 to reach the Euro 2016 quarter-finals.
Ireland took the lead when Shane Long was bundled over in the box by Paul Pogba in the opening minute. Robbie Brady coolly converted the penalty to give Ireland a shock lead.
France could not find a way through in the first half, but in the second half Antoine Griezmann equalised with a header after being left unmarked in the box. Griezmann doubled his tally for the day just minutes later.
Ireland suffered a real blow when Shane Duffy was sent off for a professional foul on Griezmann, who was almost clear through on goal, and despite a late rally could not find an equaliser.
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Wales made the last eight of Euro 2016 after an own goal from Northern Ireland's Gareth McAuley settled a tense Battle of Britain in Paris on Saturday.
But the support of Northern Ireland's fans was unconditional, with many staying behind after the final whistle, singing the now famous Will Grigg's on fire song.
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Wales and Northern Ireland fans have united in excitement ahead of tonight's last 16 clash at Euro 2016.
Large crowds have gathered in Paris ahead of the richly anticipated home nations face-off.
The game kicks-off at 5pm and is being played at the Parc des Princes stadium in the city.
ITV News correspondent Ruth Gorman tweeted a video of both sets of fans chanting "Will Grigg's on fire", despite the Northern Ireland player having not played in the tournament so far.
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