Hello, my name is XXXXX XXXXX it is my pleasure to assist you with your question today. Legally, yes it is possible. You can make an employment offer that is conditional on specific terms, for example on the original employee actually going off on ML. Similarly, you do not have to define a specific start date for the job, you can leave it as 'open' or specify a window and provide the employee with some notice of the required start
OK, thanks, XXXXX XXXXX clear.