Spurs won the game thanks to a first-half penalty from Harry Kane, a smart side-footed finish from Heung-Min Son and a second-half header from Toby Alderweireld.
Leeds had started the contest brightly, with Gjanni Alioski hitting the side netting as the Whites had 18 shots on Hugo Lloris's goal but failed to adequately test the French international.
Bielsa lamented United's defensive errors which led to their first defeat in three games.
"In the game we created 10 chances and didn't score any goals and our opponents created 12 and they scored three," he reflected.
"The fundamental difference was the efficiency and the fact that their offensive game came about through errors we could have avoided.
"The capacity for our forwards to unbalance their defence was sufficient and the capacity to defend was also good.
"The situations that came about from us made it very difficult to defend from our own half and this is where we must polish our performance.
"This game is comparable to the ones against Chelsea and Manchester United and in that sense we have improved and today we were in condition to have a closer game.
"We didn't manage it because we made mistakes that could be avoided. We have gone through similar problems and it is not through a lack of experience because we are in condition to take better decisions."
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