Newport Gwent Dragons forward Ed Jackson has undergone neck surgery.
The Dragons said that 28-year-old Jackson suffered a "non-rugby related injury" earlier this month.
Jackson, a Bath academy product, played for Doncaster, London Welsh and Wasps before joining the Dragons in 2015, while he also captained England at under-16 and under-18 levels.
In a statement, the Dragons said: "Newport Gwent Dragons today confirmed that back-row forward Ed Jackson suffered a non-rugby related injury on the 8th April, 2017.
"He has undergone a neck operation, which was a success, and the surgeons are satisfied with the results. Ed is making significant progress and is currently recovering in hospital.
"Newport Gwent Dragons will be making no further comment, but will continue to share further updates when made available.
"We would also like to ask that the privacy of Ed Jackson and his family are respected at this time."