Labour law is connected to private law principles despite of it’s hybrid characteristics. The contractual freedom is applied in this legal sector in a modified way compared to the classic parts of private law (e.g. civil law). This article deals with the provisions which limit this freedom of contracts in order to fulfill the protective feature of labour law. The center of our consideration was the question: is in the time of globalisation correct still to talk about contractual freedom in labour law or should this principle be replaced/filled up with a wider one, which would include also the feature of employer protection and contractual fairness?