After their recent uptick in form before their draw with Nottingham Forest last weekend, Amorim feels his said are "more confident", believe they "can win any game" and "have proved that already". But he added: "The last game was tough on us because, in some moments, we weren't the team that we were supposed to be."
He continued: "We know we cannot forget we have a lot to improve. We are more prepared for anything that happens in the game, so that is also a good thing. We are in a better moment, but we also know we have a lot to do, a lot to improve to win this kind of game more and consistently win games in a row."
On what has changed since their last meeting with Tottenham in the Europa League final in May: "First of all, the characteristics of the players. We have different characteristics in our team, but we also have a lot of players who played [last time]. So we are a better team, we play better, we understand the game better."
The United boss added: "We are more confident. We reached that final confident we could win because we were doing well in Europe. In this moment, we play with a different confidence. If you remember that game, they have that shot on goal and they won the game. I expect a different game - that we can play better, but also have a little bit of luck to help us to win."
Asked whether there have been any changes to reduce injuries in the side, he responded: "No, it's not changed. It's one game every week and then, again, a little bit of luck. Sometimes you have problems with players with knocks, and it's not something that is soft tissue [injuries]. So, you never know what is going to happen in the next training [session]. But the big reason is one game every week - you can give an extra day to the players you know could struggle."
After comments made about the club by former player Cristiano Ronaldo, Amorim acknowledged that Ronaldo "knows he has a huge impact in everything he says" but "what we need to focus on is in the future", adding: "We know that we, as a club, made a lot of mistakes in the past, but we are trying to change that. So let's not focus on what happened. Let's focus on what we are doing now - and we are doing that."
On if their lack of clean sheets is a problem: "It is a problem - especially if you see the league nowadays. The team that is winning all the games is not conceding goals. We cannot suffer the amount of goals we are suffering, and that is a thing that we need to improve."