William Gallas gives an exclusive interview in tonight's official matchday programme against FC Twente.
The defender - who will miss the Champions League group stage match because of injury - gives his thoughts on what it takes to progress in Europe's elite competition.
"The quality is most certainly here at Spurs, we have a lot of good players at this club and if we believe in ourselves, then we can be successful," said the 33-year-old, who has won 84 caps for France and featured in all of his country's games at the 2006 and 2010 World Cups.
"But to be successful, we have to concentrate and be focused in every game we play.
"If you do not concentrate and make a mistake, at this level you will be punished by conceding a goal, or if you don't score at the right moment, you can lose three points quite easily.
"This competition is a step up from the Premier League and we have to be ready for that.
"Against Werder Bremen in our last match we went 2-0 up and I think we did the hard job of scoring first," added William, who has over 80 appearances in European club competition.
"We conceded two goals and returned to London with just one point, which was a good result after all, because we didn't lose in a difficult away game. But from the position we were in, we should have taken all three points.
"That's the thing about the Champions League, even at 2-0 you have to focus as a team and complete the job to ensure maximum points."
Tonight is another Champions League special edition programme, A4 on size, 100 pages.
ALSO IN THE PROGRAMME...
Harry Redknapp - the manager's exclusive column.
Steve Perryman - the legendary former skipper reveals his hero.
Steven Caulker - reflects on his debut against Arsenal.
One-goal wonders - remembering Erik Edman's wonder strike at Anfield.
National service - profiling our players on international duty against the Netherlands.
Ossie Ardiles - recalls a fine win against Ajax in 'Memory Match'.
FC Twente - the lowdown on our Dutch opponents.