And if his proposed employer finds out he lies to his employers, then what?
OK, so he doesn't deny it. Instead, he can avoid the question.
Boss: "I heard from a client that he heard that you interviewed at X Corp. What's going on?"
Dallastiger: Well, someone at X Corp asked me questions with respect to an open position. Maybe they are poking around?
Boss: Are you interested in this position?
Dallastiger: (laughs) well, I don't have an offer from them so there's nothing to be interested in. By the way, can I talk to you about that project you assigned to me last week?
The two walk off to get coffee. No lies we're told. Same result.