Second-half goals from Michael Dawson, Jamie O'Hara, Roman Pavlyuchenko and an own goal from Michael Duff turned the game on its head after Martin Paterson's close-range finish had sent the Championship side in ahead at the break.

Redknapp told Sky Sports: "I was impressed with them tonight. In the first half they were fantastic, they played five in the middle, they broke and they passed the ball.

"At half-time you could not see that result coming, that was for sure, and nor could I. At half-time I had to get in to them big time and sort a few of them out really.

"(In the second half) we were a different team. We have got to play like that all the time. We can't play like we did in the first half.

"We squeezed up second half, got in contact with them and put them under pressure."

Tottenham defender Michael Dawson added: "The first-half performance was not good. We went in at half-time and he told us we had to respond and we did that.

"We knew one goal could change the game and we got it early."

Dawson missed Tottenham's win over Chelsea in last year's final through injury and is determined to make amends this time.

"Last year was heartbreaking," he added. "We have got another chance this year and hopefully we can take it."

Burnley boss Owen Coyle conceded his side's hopes of making the final now look very slim.

Spurs visit Turf Moor for the second leg on January 21, just needing to avoid a heavy defeat to make it to Wembley.

Told that no-one would be backing his team to go through, Owen told Sky Sports News: "I think they will be very wise. It doesn't take a rocket scientist to work that one out. But we will go to win the game and see where it takes us."