Downing knows victory over Tottenham would be a major boost for their run-in.
"If we can beat them we'll keep chopping away at them," he said. "There's no point saying we want to finish fifth or sixth. We've just got to try and win our games and see what happens.
"It's going to be a great game. They've got good offensive players and the way we're playing at the minute, we can get goals.
"They will know they are in for a tough game. We played them off the park at White Hart Lane.
"I know we lost but if you look at the game I don't know how we lost - a great game to play in.
"The way we're playing and the way they're playing, it's set up for a good game. I'm confident we can get a win."