Borussia Dortmund striker Sebastien Haller will have chemotherapy after examinations revealed a testicular tumour to be malignant. The Ivory Coast international was diagnosed with testicular cancer earlier this month and has already had one operation as part of the first phase of his treatment.
The 28-year-old, who joined the German side from Ajax in a €34.5 million (£29m/$35m) deal this summer, will now continue his recovery but will be out of action for several months.
What's the latest regarding Haller's condition?
"The operation went very, very well and he is on the right track," sporting director Sebastian Kehl told 1&1 on July 27.
"He was super stable and incredibly positive and also said to the team: 'Do your job, give everything. Make sure that when I come back we're still in the running.' And the boys will do that too."
Dortmund announced on July 30 that Haller has been diagnosed with a malignant tumour and is in need of further treatment.
A statement on the club's website read: "Sebastien Haller (28) will be absent from Borussia Dortmund for several months. The histological findings revealed a malignant testicular tumour.
"Haller therefore has to undergo chemotherapy treatment."
Kehl added: "Sebastien will now receive the best possible treatment. The chances of recovery are very good. We wish him and his family a lot of strength and optimism and our thoughts are with him during this difficult time.
"We ask the media and fans for their understanding that we will not be releasing any medical details regarding the treatment of Sebastien Haller beyond the information mentioned, neither today nor in the coming months."
Will Dortmund sign a replacement for Haller?
As Dortmund are likely to be without their new signing for some time, they are reportedly looking to bring in another striker to fill his place.
Haller had been acquired to replace Erling Haaland following the Norway international's switch to Premier League champions Manchester City.
Kehl has admitted that BVB are looking at another option to add to coach Edin Terzic's team before the new season begins.
"We are preparing for different scenarios," he said. "Edin, [CEO Hans-Joachim Watzke] and I are talking to the scouting department and working on different options and ideas. Nothing concrete at the moment."
Kehl added: "Nevertheless, Haller is missing the profile. We're working on different options. But we'll only do something if it makes sense in the end."