The 47 year-old, who played 60 tests for the Wallabies, was rushed to hospital in August with his wife Rachel and two of his children.
He underwent emergency surgery after being stabbed in the attack, while his wife had surgery on a deep cut to her arm.
Kefu said their physical wounds have pretty much healed but his wife's movement was still limited.
"She only just started her therapy on her hand so she can't move her hand at all yet, so we're hoping with some intense therapy over the next 6-12 months she can get close to full movement," he said.