Hugo Lloris says he and his teammates at Tottenham have lacked character in the big games this season.
Spurs were hoping to finish in the top-four this term, but sit in sixth place following some crushing defeats against their rivals. Most notably they were beaten 5-1 by Manchester City and 5-0 by Liverpool, both at White Hart Lane.
France captain, Lloris, told BBC Sport: "We had a lot of bad defeats. We have to show more character. We sometimes had the feeling that we gave up this season.
"It will be difficult to do worse [next season], especially against the top four or five teams."
Having finished fourth on two occasions in recent years - under former boss Harry Redknapp - expectations were high for this season, especially as the team spent over £80 million on bringing new recruits in, following the world-record sale of Gareth Bale to Real Madrid.
All of the players brought in were from abroad, with some adapting to life in the Premier League slower than others. Ultimately, the players under performing lead to Andre Villas-Boas being dismissed in December, with Tim Sherwood being instilled as boss on an 18-month contract.
Speculation is rife that Sherwood will be shown the door in the summer. Results have failed to improve, and Spurs have suffered 4-0 defeats away to Chelsea and Liverpool respectively.
Lloris thinks his side haven't given enough in some games this season.
He said: "We sometimes had the feeling that we gave up this season. In this league you have to be 100% every time.
"We can't allow this kind of behaviour."
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