Under Illinois law, the elements of a claim for tortious interference with a contract are that: • The plaintiff and a third party entered into a valid and. It is clear that Illinois recognizes a cause of action for interference with the professional relationship between attorney and client.Wrongful or tortious interference with contracts happens when a thirdparty intentionally causes a contracting party to commit a breach of contract. A valid and enforceable contract between you and another party is required to recoup for tortious interfering with a contract. The first, under tort law, is against the third party who interfered with the business relationship. Another common business tort is the intentional or tortious interference with business contracts or business relationships. GECC asserts, however, that Illinois law applies and that the claims for tortious interference with prospective business relations fail under Illinois law.