Neither staff member has been named but in a separate development Rikki's mother, Ruth Neave, has issued a statement from prison, where she is serving seven years for neglecting her children, in which she blames social workers for his death.
She claims inadequate support and the failure of social workers to answer her cries for help led to her son's death.
The council said it had 'great sympathy' for the family but refused to comment directly on her accusations.
Social services director Ted Unsworth said the council had already implemented many of the changes recommended.
'The report has reinforced our belief that the changes we have made are correct,' he said. 'Child protection is one of the most difficult and challenging services facing local authorities.
'We are successfully looking after more than 800 vulnerable children and it is important the public has confidence in our ability to provide services of the best quality.'
The council has three months to implement the report's recommendations.
But the independence of the investigation has been questioned by Unison.
Spokeswoman Joanne Kaye-Smith said the council had both commissioned and set the parameters of the report and failed to interview any of the social workers involved.
The council rejected Unison's criticism's and said it had 'interviewed 17 former and current members of staff'