Thiago Silva, Pirlo, Lewandowski - who is European football's best ever free-agent?
![Thiago Silva, Pirlo, Lewandowski - who is European football's best ever free-agent?](https://i.dailymail.co.uk/1s/2021/11/24/13/50916171-0-image-a-69_1637761060333.jpg)
Thiago Silva has shown just how crucial free agent signings can be when the move works out. Which got Sportsmail thinking, who are among the greatest free-agent signings ever completed?