Barcelona striker Robert Lewandowski is upset with their Champions League elimination.

Barcelona were comfortably beaten 3-0 by Lewandowski's former club Bayern Munich last Wednesday, meaning they will drop into the Europa League for the second successive season in the new year.

"Obviously I'm not happy, Barcelona should be in the last 16," Lewandowski told La Vanguardia.

"But before I came to Barça I was already aware that the first season could definitely be more difficult than it should be.

"We are in the process of rebuilding which takes time, we must be patient. I'm sure these setbacks will make us grow as a team and that everything will be different next season.

"We are evolving. I wasn't expecting to arrive and that everything would go well in season one. I insist that it is a process that requires time and patience."