Robert Lewandowski said he was ready to take the next step forward in his career as he was unveiled as a Bayern Munich player on Wednesday.
Striker Lewandowski joined the Bundesliga champions on a free transfer from Borussia Dortmund after four years in which he won two Bundesliga titles and the DFP-Pokal and reached the 2013 Champions League final.
Dortmund refused to sell him to their domestic rivals last summer, making him play out the final year of his contract.
Last season's 20-goal Bundesliga top scorer told a Bayern news conference: "I played at Dortmund for four years, and knew it was time to make the next step now. I asked myself the question: Where do I go? The answer was FC Bayern.
"[Coach] Pep Guardiola can teach me a lot of new things. I have learned a lot from [Dortmund coach] Jurgen Klopp, but it was time to move on."
He said he wanted to "get even better at FC Bayern and win even more titles," adding: "Of course I will have to work hard. It's a new season, and there are new expectations."
Lewandowski, who will replace Atletico Madrid-bound Mario Mandzukic in the Bayern attack, said he had no concerns about adapting to Guardiola's style, explaining: "I hope the system here will suit me perfectly. I can also adapt to a new tactic -- that's not a big problem.
"FC Bayern Munich had nine players in the World Cup semifinal, might have eight in the final. It just shows how big a club this is right now.
"Every season at FC Bayern is about winning titles, I know that. We will have to work hard. It's going to be good."
Bayern sporting executive Matthias Sammer praised Lewandowski as "incredibly flexible," saying he had "all the attributes that a footballer needs."