Speaking to ESPN FC, Robert Lewandowski said: "At Bayern Munich, we have played so many times in the Champions League against Spanish teams, so it [the league] is not that new for me.
"In international football, if you are on the top, you have to be ready for every challenge, that doesn't matter who you are playing against or how tough it will be. You have to show your best, and I'm experienced, I'm ready for this.
"I need this challenge to show how my game looks in La Liga. Also there are more games in La Liga  compared to Bundesliga , so maybe I will have even more chances to score goals."
Lewandowski openly pushed to leave Bayern this summer in order to face a new challenge after winning everything there's to win with the Bundesliga giants.
The 33-year-old has signed a four-year contract with Barcelona as the Catalans look to compete with Real Madrid and reclaim the La Liga title.
Source: ESPN FC