Spurs, who began 2012 in the Premier League title picture, have lost four league games in the last two months, while their grip on the top four has slipped to goal difference alone.
"We've won one game in eight," he told The Sun.
"We have to get back to the standard that we had in the first part of the season. That's the most important thing.
"We have ended up fighting to be in the top four. We have five games to go. We want to be there. So we have to make sure that we stick together."
Tottenham travel to Loftus Road to take on QPR in the Premier League this weekend.