Gotze, 26, was tipped to become the superstar of German football after bursting onto the scene with BVB as a teenager.
After winning consecutive Bundesliga titles with his hometown club, the technically gifted Gotze became the poster boy of the German national team.
Bayern Munich then activated his €37m release clause from their domestic rivals in 2013 where he admitted the lure of playing under Pep Guardiola swayed his decision.
However, the goal-scoring hero in the 2014 World Cup never really developed further at the Allianz Arena before returning to Dortmund last season.
Since missing the 2018 World Cup, Gotze's career has reached a new low as he's yet to feature in the Bundesliga at all under new manager Lucien Favre - who has now urged him to fight for his position in the starting XI.
"I think it depends on our system," Favre told reporters in a news conference when asked about Gotze's prospects of game time.
"I said that it would take time for us to find our best team and our best system. There are a lot of tactical decisions to be made.
"We have to tell the truth. Mario can play in a central position. He can play in our 4-3-3 system. You have to play athletically and with a lot of dedication.
"Against Leipzig and Hannover, we played with three players in central midfield. Mario can play in one of those positions, but we have many players that can play there.
"We have eight or nine players there, and we have [Shinji] Kagawa and Marco Reus and Mario. There are many players. It's a fact."