Spurs winger Lucas Moura admits "something is missing" after Tuesday's 3-0 loss to RB Leipzig.
The defeat means Tottenham will go another season without a trophy.
And Moura can't quite pinpoint what has gone wrong.
"What happened last season showed we are a very good team, a very good club, that we have great players," Moura said.
"But now is a new season and a new moment. I cannot tell you what happened if it is about mentality, about confidence, but we know that something is missing.
"I don't think there is a lack of confidence. We know that we have good players, we have a good squad and we can do better. It is just football.
"Sometimes you can try everything you play well, you don't win. It is just something that is missing. We will find the winning way again. We need to keep fighting and working."