The Liverpool target has been withdrawn from Borussia Dortmund training after suffering from muscular problems.
Germany World Cup winner Gotze, 24, said: “I’m currently undergoing treatment and will do everything in my power to be back in training and helping my team to achieve our common goals as soon as possible.”
Dortmund’s sporting director, Michael Zorc, added: “We’re happy to have now uncovered the reasons for Mario’s difficulties and are convinced that his extraordinary abilities will give us additional quality once he has completely recovered from this.
“Mario has the full backing and maximum support of everyone at BVB during his recovery!”
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