Harry Redknapp believes we will need to be at our best tonight if we are to get past Watford and book our place in the Carling Cup semi-finals.
We travel to Vicarage Road hoping to reach the last four of the competition for the third season in a row, but the gaffer knows The Hornets will make it difficult for us.
Led by new manager Brendan Rodgers and assistant Frank Lampard Snr, Harry's brother-in-law, the Championship side will no doubt see a home clash with Spurs as a great opportunity to make a name for themselves.
And Harry also expects our opponents to vary their style to adapt to coming up against a Premier League outfit - just as they did when they defeated West Ham in the third round.
"I'm told Brendan is a terrific young coach and Frank has gone in to help him so I am sure they will be a good footballing team," said Harry.
"It will take a while for him perhaps to get them playing as he wants them to play but it will be a tough game.
"They've knocked West Ham out in one of the earlier rounds so it will be a tough, tough game there is no doubt about that.
"They will be a different team to what you see playing in the league every week. They will raise their game massively. Remember, Watford were a Premier League club not too long ago."
On coming up against Frank for the first time during his football career, Harry added: "It will be strange because we've always been together. I will speak to him beforehand."