The manager and players made no excuses for a below-par performance that saw us scrape into the fifth round thanks to Rafa van der Vaart's goal just before half-time.
Championship side Watford had the better of the match and the majority of the chances at Vicarage Road.
However, Carlo Cudicini made key saves, Michael Dawson and Kyle Walker blocked goalbound efforts and Watford on occasions might have done better in front of goal.
Instead, Rafa's 30-yard strike after Kyle's burst forward secured the victory.
"They say it's better to be lucky than good," smiled Harry. "We were lucky. We weren't good.
"We are normally good, but that wasn't the Tottenham team that I see every week. We just didn't get going. We were poor and we had to ride our luck a bit.
"We were off-colour but sometimes you need that bit of luck.
"You have days like that.
"Last week we played well at City but got nothing, we ended up losing in the last second. This time we didn't play well but we nicked the game.
"I said to the lads that we are miles better than that but we are still in there and I think we have a good chance this year.
"Full credit to Watford as well, they were fantastic. They worked their socks off."
The draw for the fifth round of the FA Cup will take place on ITV1 at 3.40pm on Sunday. We are number 10 in the draw.