Borussia Dortmund striker Sebastien Haller left the team's pre-season training camp in Switzerland on Monday after a tumour was found in his testicle.
The Ivory Coast international joined the German club earlier this month as a replacement for Erling Haaland, who has signed for Manchester City.
"In the course of intensive medical examinations, a tumour was finally discovered in the testicles during the course of the day," Dortmund said.
"During the coming days, further examinations will take place in a specialised medical centre," they added.
Dortmund paid Ajax €31 million ($31.5 million) for the 28-year-old after he scored 47 goals in 66 appearances for the Dutch side after joining in 2021 from West Ham United.
His 21 league goals in 31 games saw him finish as top scorer in the 2021/22 Eredivisie as Ajax secured a record-extending 36th title.
Haller also etched his name into Champions League history, scoring in all six group games - Cristiano Ronaldo is the other player to have achieved that feat - and became the fastest player to record 10 goals in the competition.
"This news today came as a shock to Sebastien Haller and to all of us. The entire Borussia Dortmund family wishes Sebastien a full recovery as soon as possible and that we can hug him again soon," Dortmund's sporting director Sebastian Kehl said in a club statement.
"We will do everything in our power to ensure that he receives the best possible treatment," he added.
Dortmund's first game of the new Bundesliga season is against Bayer Leverkusen on August 6, eight days after heading to third-tier 1860 Munich in the first round of the German Cup.
100 notable summer transfers
The five pillars of Islam
1. Fasting
2. Prayer
3. Hajj
4. Shahada
5. Zakat
Results:
5pm: Maiden (PA) | Dh80,000 | 1,200 metres
Winner: Jabalini, Szczepan Mazur (jockey), Younis Kalbani (trainer)
5.30pm: UAE Arabian Derby (PA) | Prestige | Dh150,000 | 2,200m
Winner: Octave, Gerald Avranche, Abdallah Al Hammadi
6pm: Arabian Triple Crown Round 3 (PA) | Group 3 Dh300,000 | 2,200m
Winner: Harrab, Richard Mullen, Mohamed Ali
6.30pm: Emirates Championship (PA) | Group 1 | Dh1million | 2,200m
Winner: BF Mughader, Szczepan Mazur, Younis Al Kalbani
7pm: Abu Dhabi Championship (TB) | Group 3 | Dh380,000 | 2,200m
Winner: GM Hopkins, Patrick Cosgrave, Jaber Ramadhan
7.30pm: Wathba Stallions Cup (PA) | Conditions | Dh70,000 | 1,600m
Winner: AF La’Asae, Tadhg O’Shea, Ernst Oertel
Dr Afridi's warning signs of digital addiction
Spending an excessive amount of time on the phone.
Neglecting personal, social, or academic responsibilities.
Losing interest in other activities or hobbies that were once enjoyed.
Having withdrawal symptoms like feeling anxious, restless, or upset when the technology is not available.
Experiencing sleep disturbances or changes in sleep patterns.
What are the guidelines?
Under 18 months: Avoid screen time altogether, except for video chatting with family.
Aged 18-24 months: If screens are introduced, it should be high-quality content watched with a caregiver to help the child understand what they are seeing.
Aged 2-5 years: Limit to one-hour per day of high-quality programming, with co-viewing whenever possible.
Aged 6-12 years: Set consistent limits on screen time to ensure it does not interfere with sleep, physical activity, or social interactions.
Teenagers: Encourage a balanced approach – screens should not replace sleep, exercise, or face-to-face socialisation.
Source: American Paediatric Association
Lexus LX700h specs
Engine: 3.4-litre twin-turbo V6 plus supplementary electric motor
Power: 464hp at 5,200rpm
Torque: 790Nm from 2,000-3,600rpm
Transmission: 10-speed auto
Fuel consumption: 11.7L/100km
On sale: Now
Price: From Dh590,000
Specs
Engine: 51.5kW electric motor
Range: 400km
Power: 134bhp
Torque: 175Nm
Price: From Dh98,800
Available: Now
Our family matters legal consultant
Name: Dr Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
