The Dortmund website said: "good news for Mario Goetze: Borussia Dortmund's Germany global speaks positively about the first phase of his treatment", but included no direct quotes.
The German global was diagnosed with a metabolic disorder back in February, and news coming from the club today has stated that he will, at best, be able to join training by the early summer.
"The long term target for the player is to be fully fit and ready to play for the start of next season", the club said.
Last month, Dortmund revealed that medical tests to see why Gotze had been suffering from repeated injury and a lack of form had shown up "metabolic disturbances".
Götze was diagnosed with metabolic disorder in February, which meant that in the first instance it was necessary to make sure the World Champion was withdrawn from training. Currently, the midfielder is in rehab and completing an individual training program.
In February it was announced that the Germany global, who scored the winning goal in the 2014 World Cup final, would be out for an "unspecified period of time" due to a disorder.
Chief executive Hans-Joachim Watzke also wished Gotze a fast recovery "in the name of BVB's ten million fans".
The club have been purposefully vague about the player's condition and the rehabilitation plan.