Spurs manager Mauricio Pochettino has lashed out at his players after Wednesday's 2-2 draw with Olympiakos.
The visitors held a two-goal lead thanks to Harry Kane and Lucas Moura.
But Daniel Podence and Mathieu Valbuena rescued a point for the Greek giants.
And speaking after the game, Pochettino said his players did not follow his instructions.
Asked what went wrong from Tottenham, Pochettino said: "I think it's easy to explain. When we are not showing that intensity that the competition demands we struggle. We are not talking about quality. We're talking about being focused, concentrated, aggressive, anticipating the action.
"How many times did we anticipate today? How many times we were not proactive like we were against Palace. That is a very good example in three days, it's a massive difference. It's not about tactics, it's not about quality players, it's about the quality of preparing yourself to be ready to fight.
"At this type of level you need to match the opponent in terms of intensity, aggression, in excitement and motivation and then is going to appear your quality when you are connected with the game.
"That's the first demand you need to work with. It's not only the responsibility of one person. It's everyone's responsibility and it's not possible to, in three days, how we start the game today be a massive difference. That is my disappointment. I feel disappointed for everyone."