Borussia Dortmund striker Sebastien Haller, who was diagnosed with testicular cancer in July, announced on Thursday he will undergo surgery. He made the announcement on social media site twitter.
France-born Haller joined Borussia Dortmund from Ajax in July to help fill the hole left by the departure of Erling Haaland to Manchester City.
A few days after signing Haller felt pain and club doctors made the diagnosis.
Borussia Dortmund, Ajax and another former club West Ham have all tweeted their support for Haller
