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Polish striker Robert Lewandowski said he was aware of the "huge challenge" which awaits him at Barcelona as he was presented at the Camp Nou on Friday a week before La Liga kicks off.
The 33-year-old, who signed last month from Bayern Munich for around 50 million euros, was unveiled as a Barcelona player alongside club president Joan Laporta.
"I am very proud to be here...it is a huge challenge, not just as a striker but also to push other players to give the best of themselves," he told a press conference.
"I know that recent times have not been easy for the club...but I know that I can be much better in the future with this team...we have enormous potential," he added.
Lewandowski joins Barcelona in the midst of a financial crisis yet although the club have racked up debts of almost one billion euros.
He was presented on the pitch wearing the 9 on his back which belonged to Dutchman Memphis Depay last season.
"It's a historic day...this operation was not easy," said Laporta.
Lewandowski joined Bayern in 2014, scoring 344 goals in 375 competitive matches and broke the Bundesliga's single-season scoring record.
But he left the German champions under a cloud after a dispute over a new contract as well as clashing with coach Julian Nagelsmann over tactical choices.