"Jesse was assessed by a team of New Zealand Cricket medical staff and external consultants in New Zealand, England and South Africa," Stalker said.
"He showed a tear of the rectus abdominis muscle. It is a very complex injury and, unfortunately, has not responded as well as we would have hoped."
She said Ryder was assessed yesterday by a team of consultants in Auckland who recommended the abdominal procedure.
"Next week's surgery will strengthen Jesse's lower abdominal wall to provide support to the area in general and will allow his rehabilitation to progress."
Ryder is expected to begin rehabilitation shortly after surgery.
New Zealand selectors' spokesman, Mark Greatbatch, said Ryder was obviously disappointed but realised that surgery was the best option.
"He will have to undergo extensive fitness testing then prove himself fully fit in domestic first class cricket. His return to the Black Caps is entirely dependent on him being fit and injury free," Greatbatch said.
