Lopetegui is preparing for his first preseason with West Ham.
“I think that we are going to have time to work on the skills of the players, but I think that we have a good base and a good platform to start working from,” he said.
“They are playing with quality and of course I'm totally willing to try to improve this squad. We will be humble, but we can be humble and at the same time ambitious. I think this is the platform we have to try to put in (our philosophy) on the first day.
“You can be humble in football, but you can also show that you have big ambitions every day because this is your responsibility. When you wake up, you have to show every day that you want to improve, improve and improve, and this will be our demand.”
On succeeding David Moyes, Lopetegui also said: “David has done very good work here, I have huge respect for him as he has the third-most matches (managed) in the Premier League, which is incredible, but now we are here because we have this aim, this desire and this commitment with our work for the Club, too.
“So, we are going to work very, very hard first of all to try translate to the players our way to work every day, with a big demand. Of course, being able to have all this energy around the Club, too, I am sure that we are going to have the help of all the workers in the Club too.
“It is never easy because there is nothing easy in football. All the things you are going to achieve come with big challenges, but we believe in this way to work and we are going to try to do it.”