However, the Croatia midfielder has urged teammates not to dwell on Leeds' injury-time penalty.
Modric told Spurs' website: "We're all disappointed. We had the game in our hands but Leeds managed to score in the last minute.
"We all knew that Leeds are a good team and it was going to be tough, they beat Manchester United at Old Trafford, after all, but we deserved the win.
"We didn't take our chances and in the end we conceded a bit of an unlucky goal. I'm not sure if it was a penalty or not, but it was given and we need to quickly move on because we have another big game against Fulham on Tuesday."