Sebastien Haller has to leave Borussia Dortmund pre-season camp as club reveal a ‘testicular tumour has been discovered’

NEW Borussia Dortmund star Sebastien Haller has been forced to leave the club's Swiss pre-season training camp after a 'testicular tumour was discovered'.

The German giants confirmed the news on their official social media pages.

Former West Ham striker Haller, 28, arrived in a £28million deal from Ajax less than two weeks ago.

A read: "Borussia Dortmund striker Sebastien Haller had to leave the BVB training camp in Bad Ragaz, Switzerland, early due to illness and has already travelled back to Dortmund.

"The 28-year-old international from the Ivory Coast complained of being unwell after training on Monday morning.

"In the course of intensive medical examinations, a tumour was finally discovered in the testicles during the course of the day. 

"During the coming days, further examinations will take place in a specialised medical centre."

BVB sporting director Sebastian Kehl said: "This news today came as a shock to Sebastien Haller and to all of us. 

"The entire BVB family wishes Sebastien a full recovery as soon as possible and that we can hug him again soon. 

"We will do everything in our power to ensure that he receives the best possible treatment."

The statement continued: "Borussia Dortmund asks that the privacy of the player and his family be respected and that no questions be asked. 

"As soon as we have further information, we will inform you in consultation with the player."