The 27-year-old, who won the Uefa Cup in consecutive seasons with los Rojiblancos and enjoyed World Cup and European Championship success with Spain, felt his opportunities for glory had dried up in Sevilla.
As a result, Navas jumped at the chance to tackle "a new challenge" with Manuel Pellegrini's side, saying that City provide him with the opportunity to add to his medal collection.
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"I was used to winning titles with Sevilla and Spain, I wanted to keep doing it and I had that option with City. They bet everything for me.
"I wanted to experience something new. What I got in Seville was unique, but I wanted a new challenge."
Navas has not always been awarded a starting berth under Pellegrini, but the Spaniard was keen to heap praise on the former Real Madrid coach for his tactics, admitting he feels like an important player.
He continued: "Pellegrini has welcomed me very well. He is a hard-worker, humble and simple. He likes his teams to have the ball and he has had success everywhere.
"I am very impressed with the Premier League rhythm. The games are very direct and the league is very competitive.
"Manchester City does not intimidate me and neither does the squad. In Sevilla I also played big games. I feel an important player for City and I am happy."