The White Hart Lane outfit have suffered a real dip in form since late February, with only one win in nine games.
With Blackburn, Bolton, Aston Villa and Fulham left to play, Redknapp is targeting 12 points.
“Nothing’s changed. We’re playing the same way. We train, everything’s been the same,” he told Sky Sports.
“I’ve felt we’ve played well, apart from the Norwich game at home. Chelsea in the cup semi-final didn’t go our way, but in the league, apart from the Norwich defeat, I think we’ve played very well.
“We’ve just got to pick ourselves up. Nothing’s change. I think maybe one or two are looking a little bit tired and we’ve run short in terms of having a strong squad. I’m not in a position where I can change my squad and make eight changes.
“We’ve lost some key players at the wrong time, Kaboul, Dawson and now Assou-Ekotto. Three defenders look like they’re out for the rest of the season so it’s been difficult.
“No excuses. We’ve got four games to go. We can still do it. We’ve got to win four games. We’ve got to go on a good run now.
“We’ve got to make sure we finish fourth first of all, or third. We’ve got to make sure we’re in a position where we qualify, if we don’t it doesn’t matter what happens.
“We’ve got to go for that qualification and see where it takes us. It’s still wide open, Arsenal, Chelsea, ourselves and Newcastle. It’s still any two from four,” he concluded.
By Gareth McKnight