There are signs that someone has plan to quit, e.g. suddenly calls in sick from time to time, frequently take "secretive" calls, avoids social interactions with co-workers, less engaged than they used to be, and acts more quiet during meetings. Being a manager for many years I find that "I had a bad feeling" almost always turns out to be correct.
I have an employee doing this now. As his manager it is not that hard to sense it and the natural reaction is do I want to keep him or not? In this case, I don't want to keep him (for various reasons, not because I don't think his skill is not qualified for the job). What should I do then before he officially announces?
---- update ----
I said I don't want to keep him if I notice he has a desire to quit. That is a big if. If he doesn't show signs to quit, of course I want him to stay too. I am not sure if this logic is hard to understand or not because from the answers and comments I got I feel they didn't get this.
---- update 2 ----
My question was closed so I added some information, hoping it can be reopened and get more answers.
First, as I commented to some answer he actually had announced it and then I asked the question in hindsight, thinking about is there anything I should do during that time. But not as one comment said "I was just probing to see if anyone will back me up".
Second, I held a meeting with my guys, telling them that I know the situation is tough if they need to advice/help please just come to me. But I didn't talk to that guy in particular. I thought about it but chose not to, which probably was a mistake.
Hence my question, what should do during that time ?