"It was always going to be difficult. It was a good start in the first 25 minutes, but the manner of the goal, the way it went in, it took it out of the boys and deflated them," he told BBC Sport.
"I am very proud of the players and very proud of the players this evening. They put in a huge amount of work and they have done themselves and the club proud and we should have scored at the end.
"I want to keep progressing in the league and keep progressing year in, year out. We have time to add to the squad and improve things."
Spurs will take on Rochdale in the next round of the FA Cup.