Indeed. This was from The Secret Footballer
"Here’s something that some of you will find obvious and some of you will find surprising: Ninety-five percent of all transfers in professional football happen through tapping up.
But what is tapping up?
Well, strictly speaking a buying club is supposed to contact the selling club regarding*the availability of the player that it would like to sign. But here’s a fact: That’s not how football works.
The reality is that either the club contacts the agent asking after a specific player or the agent contacts the club peddling his players.
It’s all but impossible to prove that an agent and a chief executive of a club are speaking about a specific player. And therefore it’s all but impossible to prove that tapping up goes on.
As a result, tapping up is the industry standard for almost every transfer in the game. It’s easier. It’s less time-consuming."
Sounds highly believable to me!