Jermaine Jenas insists Tottenham's defeat away to Inter Milan has left them brimming with belief.
The North London club played the reigning European champions in Italy a month ago in a thrilling game.
Inter raced to a four-goal lead at the interval as Spurs were reduced to 10 men, only for man of the moment Gareth Bale to plunder a second-half hat-trick.
And after another second-half display against Arsenal in which they came from two goals down to win 3-2, Harry Redknapp claimed his side could even win the Premier League.
Jens insists it was that game in Italy that got them believing.
"It was a bit of a catalyst," said Jenas. "We didn't perform in the first half, went down to 10 men and people wrote us off completely.
"But what we did in the second half was we gave ourselves a mental victory with the way we performed.
"We had Inter on the ropes with 10 men at the San Siro. Not many teams will go there and do that.
"And in doing that, we looked at ourselves and said, 'We can do anything if we're all at it'.
"We've got to continue to use those things as tools and use them in a positive way."
While Redknapp has claimed his side are candidates for claiming the Premier League crown, Jenas is a little more cautious.
"It's a long season," he added.
"There will be ups and downs. It's the tightest league for ages and it's just a matter of stringing some wins together."
Tottenham resume their Champions League exploits on Wednesday against Werder Bremen.
And should Spurs manage to clinch a win, it would secure their place in the next phase of the competition.
"Obviously with such a busy schedule coming up through Christmas, if we can get through tomorrow night, it would be a weight of our shoulders," Jenas continued.
"We can put the Champions League aside a bit. It would be nice to go through and concentrate on the Premier League over Christmas."
An injury to Tom Huddlestone which looks to have him sidelined until the New Year has allowed the former Newcastle midfielder to kick-start his club career.
With his form and confidence starting to return, he also hopes to catch the attention of Fabio Capello.
"It's been a tough year with a lot of speculation about my future and injuries," he explained.
"I'm back to my best and my confidence is high. I want to maintain that now.
"There is definitely a lot of work to do to get back in the [England] squad.
"If I can get a run of games together and play at a consistent level then I'm pretty sure I'll feature in his plans again at some point."
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