The Dutchman released a statement on Thursday, which read: "I'm very grateful the brain aneurysm got discovered.
Ricky van Wolfswinkel challenges for an aerial ball in the previous round against PSV
Image credit: Getty Images
"Normally a brain aneurysm is not discovered in time, only after it has ruptured and caused other damage.
The doctors made multiple scans and eventually found out that I have a brain aneurysm.
"The hit I got in the game has absolutely nothing to do with the existing brain aneurysm - this has been there for a long period but I didn't have any symptoms so we didn't know it was there."
Van Wolfswinkel's only Premier League goal came against Everton
Image credit: PA Sport
Van Wolfswinkel signed for Norwich from Sporting CP in July 2013 for £8.5million but scored just one goal - on his debut againat Everton - in 28 appearances.
He was sold to his former club Vitesse three years later. Van Wolfswinkel will be sidelined for at least six months, but a return date is dependent on the reaction of the brain aneurysm following treatment.