"Our dream is to build a spectacular team but it would not be a failure if we didn't win a title," Perez told Spanish television station Cuatro on Tuesday.
"We are at the start of a new project. We are giving it stability. We aren't going to get nervous because it hasn't all come together perfectly in the first year."
Perez's return in June for a second spell as president set in motion a 250 million euro reconstruction programme that brought in players like Cristiano Ronaldo, Kaka and Karim Benzema.
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