Tottenham Hotspur's first-team coach Gus Poyet insists their FA Cup tie against Manchester United on Sunday has put an end to their Carling Cup celebrations.Tottenham have been in joyous mood after their 5-1 thrashing of Arsenal in the Carling Cup semi-final second leg at White Hart Lane on Tuesday. The White Hart Lane side's victory has set up an all-London final against Chelsea on February 24 but Juande Ramos' side have another important cup-tie awaiting them at Old Trafford. Poyet now believes that a win over the Premier League champions would be the perfect way to prove that their victory over arch-rivals Arsenal was not just a one-off. Poyet declared: 'This will be a massive game for us but we're full of confidence and we're not worried. We've enjoyed the celebrations but now we're focused. 'Sometimes you need to play another game as quickly as possible, and we need to forget about Arsenal because it's going to be another excellent game to prove the level we can play at, whether home or away.' Poyet will be hoping that Tottenham's travelling fans will be able to give them the same kind of support that inspired the players on their way to White Hart Lane for their clash with Arsenal. Although it will be a packed house at Old Trafford, Poyet says the players found the belief from fans on their way to the ground against the Gunners. Poyet said: 'We left the hotel on time but we were very unlucky with the traffic, but that helped us. 'We were probably about 10 minutes late, but the approach to White Hart Lane was unbelievable, and the crowds when they saw the bus were magnificent. 'I don't know if the players were tense or nervous before then, but after seeing that, they were ready. 'We were sure that we were ready because we were better than Arsenal in two recent games at the Emirates, but we didn't win, so it was just about turning the performances into a win.'