The 27 year old German attacker claims that he is pertinacious to bulk up while he is recovering from his injury, while he made an outstanding return to the field.
The 27 year old Dortmund star says that he is now a 100 per cent different player after he came back to the starting line up from adductor injury.
This season the superstar missed couple of matches because of his Adductor injury but then he came back in to the first line up under Thomas Tuchel and in that match the Dortmund side beat their opponents Legia Warsaw by 8-4 goals in a Champions league match.
The 27 year old German superstar has already scored three goals for his side in his just four Emergences and also he made some couple of important assists,
In their last Champions league match he scored a goal for his side against Real Madrid and gave his team a crucial important away point.
Last season he played the DFB Pokal final against Bayern and he got injured in that match after that he was out for many months and because of his Injury he also missed out the EUFA Euro cup which was held at France, he misses that tournament because of his injury.
But the German International thinks that short time of spam benefitted him a lot.
"I had lots of time to think about what I can change,"
"Gaining more muscles is a part of that. I feel 100 per cent different now."