Livio Suppo explained that the Australian rider feels better now compared to the first Sepang session but there's still the possibility to see the injury getting worse.
"As far as we haven't got the races we can't say (how it really is), but he's more happy than the first test in Sepang that was difficult for him," said Suppo.
"In Qatar it was already much better and in Jerez it was better again. It's been a big surgery. Kind of three surgeries in one. One was the bone, one was to clean everything around the bone. It's not easy. It takes time to come back.
Moreover, Suppo says that Stoner never recovering from the injury is also a possible scenario but everybody hopes to see the Australian rider get back on track.
"Maybe he won't ever be like before. It's like Mick Doohan's leg was never like it was before, but he could still ride and still win five championships. So I'm not saying it's not impossible for Casey to move again his wrist like before, but sure it can be that he has to live with it," he said.
"Surgery is always something that could stop something that was going to be worse. His wrist was really bad."