Borussia Dortmund striker Sebastien Haller said a second operation to remove a testicular tumour was a success.
'A new step ticked off. Operation number two went well! A big thank you to the medical team for their daily help,' the 28-year-old wrote on Twitter on Thursday.
The 28-year-old has been undergoing chemotherapy after being diagnosed with testicular cancer in July.
Haller spent 18 months with West Ham after joining in 2019 for a then club-record £45million from Eintracht Frankfurt.
He moved to Ajax in January last year and signed for Dortmund this summer.