The 23 - year - old went into this season as a frustrated substitute in the Ruhr valley .
Lewandowski performed so far above expectations when given a chance up front that he sent a Dortmund hero packing to the Chinese Super League .
The 23 - year - old went into this season as a frustrated substitute in the Ruhr valley , but Lewandowski performed so far above expectations when given a chance up front that he sent a Dortmund hero packing to the Chinese Super League .