Lewes manager Steve Ibbitson believes they can win their FA Cup fourth qualifying round tie.
The Rooks, who sit bottom of Blue Square Bet South, are away to Cambridge United on Saturday.
Ibbitson told BBC Sussex: "It is a winnable game. I'm not saying we're favourites or are going to win it.
"If we get a bit of luck or play reasonably then we'll have half a chance. We'll be going up there in a positive frame of mind."
Ibbitson believes that Cambridge may underestimate his side after a 2-0 home defeat in their last league outing against Dorchester.
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"The good thing about the Dorchester game is that Cambridge came down to watch us," he said.
"We certainly are a better side than we showed against Dorchester so they'll go back and think that we are worse than we are."
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