Dortmund striker Sebastien Haller diagnosed with a testicular tumour

The former West Ham man will undergo more tests in the coming days. 

DIAGNOSIS: Sebastien Haller says he felt unwell following training. 

Former West Ham forward Sebastien Haller has been diagnosed with a testicular tumour.

The 28-year-old underwent medical examinations on Monday after feeling unwell following training with Borussia Dortmund, the club said.