Trailing 2-1 after Spurs found two goals in the final minutes, De Ligt struck a 96th minute equaliser to earn the point for the visitors.
Afterwards, the Dutchman said: "Luckily we got a point, I think we deserved more the way we played, I felt the second half we were a little tired. We didn't get the chance to get out of our half.
"Their first goal was a bit lucky, I'm a bit upset about that, but I'm proud of how the team fought back and got a point at a difficult stadium.
"Last year we lost against Nottingham Forest and Tottenham 1-0, but last week and today you see we have the fire in our bellies to fight and get a point.
"The season is long, drawing thee games is more important than losing.
"You saw today we are really dangerous, we have a lot of speed up front, we are really stable, we know our strengths and utilise them. Today we had more opportunities to get in behind them because they are vulnerable, we played a good game and I think we deserved a little more."