The Frenchman believes Spurs' historic win over Manchester United in September - their first at Old Trafford in 23 years - should serve as a reference point of what the team can achieve.
"If we believe in it maybe we can finish fourth, but there are so many teams who want to finish fourth as well," the 35-year-old said. "All the fans, people who watch football, are very excited to know who will finish fourth.
"After what we did at Manchester United we have to believe we can win anywhere.
"We played very well there, now when we play away we have to be convinced we can do something and come back to London with three points."