It is clear that Illinois recognizes a cause of action for interference with the professional relationship between attorney and client. Only intentional interference is actionable in Illinois.Negligent interference with business relations is not a recognized cause of action in Illinois. Under Illinois law, it's unethical for an attorney to date, sleep with or whatever you want to call it with a client. In this article, we will explore what tortious interference with contract is, how to prove it, and how to protect your business against such a threat. Obviously, a client can always discharge their lawyer, for any reason or no reason. In bringing the motion, the duty of confidentiality applies and cannot be revealed in the motion. Tortious Interference with business relationship or reasonable business expectancy. When a lawyer wants to invoke attorneyclient privilege they must communicate their objection to disclosure in a particular way.