2. Kylian Mbappe – Monaco to Paris Saint-Germain
On 31 August 2017, Paris Saint-Germain announced the signing of Mbappe from Monaco on loan. The fee required for a subsequent full transfer was set at a rumoured €145 million plus €35 million in add-ons, making him the most expensive teenager ever, the most expensive transfer ever within a domestic league, and potentially the second most expensive player ever, behind teammate Neymar. He was handed the number 29 shirt upon arrival in the French capital.
Transfer fee: €135 million