Kylian Mbappé — PSG to Real Madrid (2024) — Free + €150M bonuses

Kylian Mbappé's move to Real Madrid in June 2024 was technically a free transfer — his PSG contract expired — but his "loyalty bonus" of €70 million from PSG and a reported €150 million signing-on package from Real Madrid made the total cost one of the highest in history. He had refused a €300 million extension at PSG (making it the richest contract in football history) to achieve his Real Madrid dream. He scored 44 goals in his debut La Liga season. The political and commercial maneuvering around his signature involved the French president and FIFA directly.