Bournemouth midfielder David Brooks has been diagnosed with Hodgkin Lymphoma.
Brooks withdrew from international duty last week, with Wales citing illness as the reason for his absence.
The 24-year-old issued a statement on Wednesday confirming his diagnosis, and that he will begin treatment in the near future.
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"This is a very difficult message for me to write,” Brooks wrote on Twitter. “I have been diagnosed with Stage II Hodgkin Lymphoma and will begin a course of treatment next week.
"Although this has come as a shock to myself and my family, the prognosis is a positive one and I am confident that I will make a full recovery and be back playing as soon as possible.
I'd like to show my appreciation to the doctors, nurses, consultants and staff who have been treating me for their professionalism, warmth and understanding during this period.
"I want to thank everyone at the Football Association of Wales because without the swift attention of their medical team we may not have detected the illness.
"I'd also like to say thank you to AFC Bournemouth for all their support and assistance this past week.
"Although I appreciate that there will be media attention and interest, I would like to ask that my privacy is respected in the coming months and I will share updates on my progress when I am able to do so.
"In the meantime, thank you to everyone for their messages of support – it means so much and will continue to do so in the months ahead.
"I look forward to seeing you all again and playing the sport I love very soon."
Bournemouth are currently top of the Championship after 11 games.
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