Michael O'Neill's team will have to make up lost ground in their second clash of the tournament after tasting defeat in their opener, and the striker is determined to do better
Kyle Lafferty feels Northern Ireland let their fans down against Poland, but has promised a response when they take on Ukraine on Thursday.
In their first match at a European Championship on Sunday, Michael O'Neill's men lost 1-0 in Nice to an Arkadiusz Milik goal.
And, ahead of their crucial second Euro 2016 fixture against Ukraine, Lafferty knows there must be a marked improvement if Northern Ireland are to have any hope of qualifying from Group C.