Every league has a special data investigator, and almost every team in the influential leagues such as Premier League and Serie A has a special investigator ... Many investigators visit the team site one season to judge the data of all aspects of the players and finally get the data. At present, FM has real information about more than 370,000 players in more than 50 countries, 20,000 clubs.
In recent generations, the data of database player has become more reasonable and reliable. Imagine the generations who fell off the altar before-10 God, you know!
If the coach refers to buying people in this game, I have never learned such information. In addition to the examples mentioned by @ Sun, it was rumored for a while that Ferguson and Wenger often mentioned them. The reason is that the football manager has thousands of scouts, and only this person knows the truth.
You can find a negative example. In recent years, Liverpool have bought Carroll, Henderson and joe allen. These FM people are not optimistic.
As for the result, only time will tell us.