Now the striker will be hoping to make his debut for the club.
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Haller, 28, signed for Dortmund at the beginning of July as Erling Haaland’s replacement.
But less than two weeks later, he received the news of a testicular tumour.
He underwent chemotherapy and had two operations.
But now the Ivorian forward has returned to the training ground and was pictured putting in the hard yards in the gym.
Haller – whose hair has started to grow back – said in a video on the Dortmund Twitter account: “Hello guys!
“I’m finally back. It was not easy but with your support it was better and easier to do.
“I am just looking forward to seeing you in the stadium for some victories. Ciao guys.”
Haller earned his £28million transfer to Dortmund after scoring 21 goals in 31 appearances for Ajax last term.
The former West Ham man struggled to hold back the tears as he collected his golden boot award in August, publicly thanking his wife Priscilla.
Haller later told ESPN: “My wife was in shock, but she could deal with it.
“But my mum it wasn’t the same, because mothers are mothers.
“I called my brothers and sisters to make sure they will be there for her, so that she wouldn’t feel alone. This is what I have done.”
He also explained that he would spend “five days at a time at the hospital, where I am hooked up 24/7” and was unable to leave his bed while treatment was injected before a two-week rest period.
Dortmund play their first match after the World Cup break on January 22 when they face Augsburg.
Edin Terzic’s side sit sixth in the Bundesliga table, nine points adrift of leaders Bayern Munich with 15 matches played.
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