Borussia Dortmund and Ivory Coast striker Sebastien Haller has announced he is to have further surgery as he continues his treatment for a testicular tumour.
The 28-year-old first had an operation in July after a tumour was discovered, and has been undergoing chemotherapy in recent months.
Haller joined Dortmund from Ajax in July but felt unwell during the club's pre-season tour of Switzerland, with subsequent tests revealing a malignant tumour.
He has yet to play a competitive game for the German club, who responded to Haller's tweet with a message to "stay strong".
"I want to thank you all for the messages of support and the strength you give me in this ordeal. Looking forward to seeing you all soon," Haller's statement added.
Haller spent 18 months with West Ham after joining in 2019 for a then club-record £45m ($53.32m) from Eintracht Frankfurt, before moving to Ajax in January last year.
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