It is recommended to confirm the extension in writing, for example through a letter. There is no requirement to draw up a new contract. A letter will suffice as long as the conditions of employment remain the same. Make sure to inform your employees clearly. If the contract included a non-compete or relationship clause, we recommend you include the clause in the letter sent to confirm the extension of the contract and have the employee sign it (again).
By law, you do not have to notify the employee that a contract (extension) of two months is going to expire. The notice period – which means that you must inform an employee at least one month in advance that his/her contract is going to expire – only applies to temporary contracts with duration of six or more months. When a contract is extended by two months, the notice period thus does not apply. Of course, it is good manners to always inform an employee of your intentions. If you already know the contract will not be extended again, inform your employees as soon as possible. However, the question mentioned above shows that the end of the employment relationship was already discussed when agreeing to the extension.