Northern Ireland will be looking to claim their first points at Euro 2016 ahead of Thursday's Group C game with Ukraine.
Michael O'Neill's side fell to a 1-0 defeat to Poland on Sunday, and realistically must win in Lyon if they are to progress through to the knockout stages of the tournament.
"For Michael, for his coaching staff, for all the people who've paid good money to come out here, we let them down and we'll put it right on Thursday," he insisted.
"A win could take us out of this group. We still have belief. We've got two games to put it right and I'm sure we'll give a better performance than we did against Poland.
"Not one player will let the fans down. Even if we don't get the result we want on Thursday, the fight and determination that got us here will be there."
Ukraine, meanwhile, lost 2-0 in their opening game to Germany on Sunday and assistant coach Andriy Shevchenko says his team will be on the offensive at the Stade des Lumieres.
"We are still thinking about the starting line-up. There is time to choose the right tactics for the game but one thing is clear: we will attack," the former Chelsea striker told Football TV. "At the same time, we need to be accurate, especially at the back."
Michael O'Neill's side fell to a 1-0 defeat to Poland on Sunday, and realistically must win in Lyon if they are to progress through to the knockout stages of the tournament.
"For Michael, for his coaching staff, for all the people who've paid good money to come out here, we let them down and we'll put it right on Thursday," he insisted.
"A win could take us out of this group. We still have belief. We've got two games to put it right and I'm sure we'll give a better performance than we did against Poland.
"Not one player will let the fans down. Even if we don't get the result we want on Thursday, the fight and determination that got us here will be there."
Ukraine, meanwhile, lost 2-0 in their opening game to Germany on Sunday and assistant coach Andriy Shevchenko says his team will be on the offensive at the Stade des Lumieres.
"We are still thinking about the starting line-up. There is time to choose the right tactics for the game but one thing is clear: we will attack," the former Chelsea striker told Football TV. "At the same time, we need to be accurate, especially at the back."
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