Jermaine Jenas insists Tottenham believe they can now compete with the top three clubs ahead of the Carling Cup final.
Spurs have struggled against the leading teams in recent years, but they enjoyed a 6-2 aggregate win over their North London rivals in the semi-finals of the competition in January and Jenas feels that kind of performance will boost the side.
He said: "It'll give us a lot of belief, but not only that - there was a performance here against Manchester United (in the FA Cup) as well that we know we should have won, which again gives us belief that we can do it against the big three."
And the England midfielder feels the squad is 'excited' about the challenge of defeating cup holders Chelsea.
"I think the lads are looking forward to it," he told Sky Sports News.
"We've worked so hard to get there, it'd be a shame now not to go all the way and win the trophy.
"It's obviously going to be a tough one. Chelsea have been there, they've done it and they've got that experience, but the lads are up for it, we're excited and looking forward to the occasion."
He added: "It's a big club, so we should be winning trophies really and it's great that we're back in a position to achieve that."
Tottenham had a slow start to the season, but have been revitalised under new coach Juande Ramos.
Jenas himself has perhaps shown the most improvement since the new boss came in, and he insists they are all eager to reward the Spaniard with victory on Sunday.
He added: "He's simplified things for us. The main thing that he's done is made us play better as a team. He's made us more resilient, a lot stronger, and it's allowed the likes of myself to express myself the way I like to do.
"His record speaks for itself. He's helped us get to a final and we'd like to put another trophy in his cabinet and get our ball rolling for the season."