Transfer fees have gone a bit mad in recent years, and it is becoming harder and harder for teams to sniff out a bargain. Every day during the window we have seen players linked with massive money moves, and you probably haven't even heard of a lot of the names involved.
Records continue to be broken, and this summer was no exception. But how much attention do you play to the transfer market?
We want you to name the most expensive footballer of all time from 30 countries we have selected below. Some of them are obvious, others not so much. You will have 10 minutes to get them all. We've even given you one to start!
If it does not display correctly, you can take the quiz here. Best of luck!