Section 89 of Employment Act CAP 226: Savings of contracts of service made abroad

(1) Nothing in this Act shall prevent an employer or employee from enforcing their respective rights and remedies for any breach or non-performance of a lawful contract of service made outside Kenya, but the respective rights of the parties under that contract as well against each other as against third parties invading those rights may be enforced in the same manner as other contracts.
(2) Where a contract has been executed in conformity with this Part, it shall be enforced in the same manner as a contract entered into under this Act, but no written contract, tenor and execution of which are not in conformity with this Act shall be enforced as attains an employee who is unable to read and understand the contract and any such contract shall be deemed to be executed in conformity with this Act if it is signed by the names or marks of the contracting parties and bears, as concerns any illiterate parties, an attestation to the like effect as if prescribed by this Act.
(3) Where a contract is made in a foreign country, the contract shall be attested by a judge or magistrate, and shall be authenticated by the official seal of the court to which the judge or magistrate is attached.