how will you mitigate these risks?

The risk of losing a client: there are clients who have been used to their accounts manager such that they would feel insecure with a new manager.

The risk of decrease in customer satisfaction as a result of low quality of support: the new manager may not be able to provide the same experience the client has been used to.

The risk of lack of knowledge: the firm may hire a person that does not have reliable knowledge and information which can affect the business.