In Costa, Jose Mourinho finally has the quality goal-scorer he has been crying out for, while Fabregas adds even more class to one of the best midfield's in Europe and Luis arrives off the back of an outstanding campaign for Atletico Madrid.
Now the trick is to ensure the new arrivals are bedded in prior to the start of the new campaign; one which will see Chelsea going for glory not just domestically but also in Europe.
And the club have posted a vine of two of their new signings scoring with ease in a recent training session, with Costa's goal in particular showing just what a fine finisher he is.
It may look simple, but that is only because the Spanish international makes it look that way.
What do you expect Chelsea to go on to achieve next season?