Since Roman Abromavich bought Chelsea in 2003, the club has never been the same.
Every summer, the Blues are in for high profile signings. When things don't go as planned during the season, their billionaire owner is sure to bankroll another wave of them.
In the past nine years, Chelsea fans have become accustomed to seeing a very good product put on the field and continuous investment in the team to let the trophies roll in.
Though the landscape of football has changed significantly since Abromavich took over the club (and partially because of him), it is no coincidence that all of Chelsea's costliest signings have taken place under the Russian's watch.
Let's look at the 10 most expensive deals coming in and going out that Chelsea have ever done.