14 things to do as soon as you realize an employee is about to quit

There are plenty of subtle - and not so subtle - signs someone who works for you is about to jump ship.

If you're sensing that one of your most valuable employees has one foot out the door, you'll want to address any issues and try to turn things around before it's too late.

Michael Kerr, an international business speaker and author of "The Humor Advantage," says losing even just one employee can have a significant affect on many aspects of your business. "It can impact the culture in a team in a negative way. And there's a substantial cost and time commitment involved in replacing and training new employees," he says.

Here's what to do when you realize someone you work with is about to resign: