We've even given you the first one.

Can you name Tottenham’s 25 most expensive sales in history?

Tottenham have made several big-money signings over the years, but what about the players they’ve sold? We’re challenging you to name Spurs’ 25 most expensive sales in history.

In order to help you out, we’ve given you the fee received (according to Transfermarkt) and the year that the transfer took place.

There are a few sneaky answers in here, so we’d be impressed if you managed to get full marks in the 15 minutes that we’ve allocated for this quiz.

If it inspires you to want to do another quiz, try our challenge to name the Spurs XI from Harry Redknapp’s last game as manager.

If you’ve not already, sign up for a Planet Sport account to access hints for those tricky answers, to reveal the ones you’ve missed, and to register your score on the leaderboard.

Good luck and don’t forget to tweet us your scores @planetfutebol.

NEXT QUIZ: Can you name Tottenham’s top 30 goalscorers of the Premier League era?