Dual New Zealand Group One winner Say No More has joined the growing list of spring carnival casualties.

Trainer Paul Duncan has been forced to abandon plans for Say No More to contest next month's Group One Myer Classic (1600m) at Flemington after she injured her off foreleg following her first-up fifth at Doomben on September 22.

"She fractured her splint bone and will need three months in the paddock," Duncan said.

"It's very disappointing when you have a program set and it ends this way but these are things that can happen in this industry unfortunately."

Say No More joins Manighar, Seville and Lamasery on a growing list of horses who have been ruled out of the remainder of the spring carnival either through injury or illness.

Duncan is confident Say No More's injury is not career-threatening and the five-year-old will return to racing next year.

"After she has a bit of time out in the paddock I'll give her a nice, slow build up to next year's winter carnival," he said.

"Races like the Hollindale Stakes and Doomben Cup will be her aim all going well."

Say No More and apprentice Rosie Myers combined to win the Group One Thordon Mile (1600m) at Trentham in January then added the Group One Thoroughbred Breeders Stakes (1400m) at Te Aroha in April before Duncan relocated to the Sunshine Coast.

"She beat a strong field in the Thorndon Mile which included Shez Sinsational then she did a great job to win the Breeder's after having a pretty hard run from a wide barrier," Duncan said.

While Say No More is on the sidelines, Duncan is hoping talented mare Dehere And There can help fill the void left by her high profile stablemate.

"She's quite a promising mare who finished second to Zurella at her first start and I think she can make the grade over here," he said.

"She's coming back from an accident where she tore her tendon sheath and had to have six to eight weeks off but she'll be ready to race again shortly."