The job losses are being made in anticipation of staffing changes following local government reorganisation in April when Leicester city council and Rutland DC become unitary authorities.
Unions are furious, claiming the councils agreed to employ the current workforce and that if redundancy notices were needed they would not be issued until after 31 March.
But Mr Sinnott says it is the city council's obligation because it has been given the monetary resources to take on all the people being laid off.
'So, in other words, the city council will have the resources to employ the people we are now talking about.
'It is a matter for them as to whether they meet what we think are their obligations under agreements signed at both a national and a local level'.