Haller was diagnosed last week
Borussia Dortmund striker Sebastien Haller will be "out for a few months" after having surgery on a testicular tumour, the Bundesliga club confirmed.
The 28-year-old
found a tumour in his testicle last week as he prepared for the season with his new team in Switzerland, with the club confirming the news.
Dortmund sporting director Sebastian Kehl has since confirmed that the Ivory Coast international had a 'successful operation' last week.
"The operation went very, very well and he's on the right track," said Kehl.
https://twitter.com/GGFN_/status/1552246121841545217
While Kehl also revealed that treatment plans were still being discussed, he insisted that a return date had yet to be fixed.
"Sebastien will be out for a few months but once we can be more precise about that we will communicate it," he added.
Haller joined the Bundesliga outfit from Ajax earlier this month, having been at West Ham before that. He scored 34 times for the Dutch side last season - the best goalscoring season of his career.
11 of his goals came in eight Champions League games, but Ajax were eliminated by Benfica in the last-16 stage.

Haller thanks fans for their support
The striker previously
thanked supporters for the messages wishing him well, tweeting: "I want to thank you again from the bottom of my heart for all these many warm messages received.
"I was very moved to see these beautiful reactions and I even feel like I don't deserve so much."
He then added: "Thank you all for your many messages of support and affection since yesterday's announcement. My family and I thank you. I will now focus on my recovery to come back stronger."
https://twitter.com/HallerSeb/status/1549325356200599554?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1549325356200599554%7Ctwgr%5E%7Ctwcon%5Es1_&ref_url=https%3A%2F%2Fwww.joe.co.uk%2Fsport%2Fsebastian-haller-tumour-diagnosis-349270
Dortmund begin their Bundesliga campaign against Bayer 04 Leverkusen on Saturday August 6.
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