Lewandowski told Dortmund fans on the club website : ' We still have half a year ahead of us in which we have certain targets that we want to achieve together .
Lewandowski signed a five - year deal with Bayern on Saturday .
Lewandowski , who signed a five - year deal with Bayern on Saturday , told Dortmund fans on the club website : ' We still have half a year ahead of us in which we have certain targets that we want to achieve together .