The attack last Thursday initially left Ryder with critical injuries and in an induced coma in a hospital just a day before he was scheduled to fly to India to play for Delhi in the IPL Twenty20 league.
"Unfortunately Mr. Ryder has no recollection of what took place or the events leading up to the incident," Police Det. Senior Sergeant Brian Archer told Fairfax New Zealand on Tuesday.
"This is not uncommon when a victim has received a head injury of this nature. Should (he) gain sufficient recollection as his recovery continues then we may look to speak to him again. However, there are no immediate plans to re-interview him at this time."
Ryder's manager, Aaron Klee, said it was not known when the cricketer would be discharged from the hospital.
"He's absolutely talking, sitting there having conversations and he's up on his feet," Klee said. "It's nice to see the big guy back on his feet again."
Two men who are related, aged 20 and 37, have been charged with assault. They have been freed on bail to appear in the Christchurch District Court on Thursday.