And yet there are still holes to be filled and improvements to be made as we watch transfer deadline day with bated breath to see who might arrive at Stamford Bridge to add the finishing touches to a potential Premier League champion.
Fittingly, all the players linked with the Blues are of the highest profiles, and it would not be surprising to see one blockbuster deal go down in the final hours of the summer transfer window.
So here are six audacious but possible signings that Chelsea could make before the calendar turns to September.
With only two real strikers at the club, having a poacher like Javier Hernandez on hand to support or relieve Fernando Torres would be a massive asset, and one which is worth investing in.
That is why the likes of ESPN FC have reported that Chelsea have inquired about Hernandez's availability on the transfer market, and it seems this is a deal that actually has the potential to go down.
Boasting an embarrassingly rich strike force that includes the likes of Robin van Persie, Wayne Rooney and Danny Welbeck, it is difficult to see Hernandez getting significant playing time with Manchester United, especially when Rooney comes back.
That could open the door for a move to a better-fitting team like Chelsea.
Edinson Cavani has been linked with Chelsea for quite a long time, but the Uruguayan, despite endless speculation, has never moved from Napoli to London.
Spearheading one of the best attacks in Serie A, he has probably become the most feared striker in Italy, scoring 49 goals in 68 matches in the league and lifting Napoli to further success in the Champions League by overcoming Manchester City in the group stage.
Again, with Chelsea's relative lack of depth at striker, Cavani could be a big asset up front, and his blend of technical ability and pugnaciousness would work really well in the Premier League.
Of course, he could command a Fernando Torres-level fee, but that shouldn't be a problem for Roman Abramovich.
If I had a nickel for every time Hulk was strongly rumored to be headed to Stamford Bridge, I would have almost as much money as his transfer fee will be.
There is no question that a player of his talent will not remain with Porto in Portugal for too much longer, despite the fact that the club have demanded outrageous amounts of money for their biggest star.
With the ability to play on either wing, though preferably the left, and through the middle, Hulk and his considerable talents could help Roberto Di Matteo in a variety of ways, and that might make it easier to stomach the money that Chelsea will have to dish out for his services.
If there is any time to force Porto into selling for a lower price than they want to, deadline day is it.
Theo Walcott's contract situation has been one of the biggest stories of these last few days of the transfer window, and while there is more hope in North London that he'll stay on, there is precious little time for him to put pen to paper.
Arsenal could elect to keep Walcott after the transfer window closes and gamble that he will sign a new deal following promising negotiations, but this is a massive risk. Walcott will have all the leverage as soon as the window shuts and he inches ever closer to leaving for nothing.
That's where Chelsea come in.
If Arsenal are forced to sell quickly, the Blues can get the winger for a relative bargain, and the team could really benefit from an injection of pure pace on the right flank. Don't be too surprised if this is one of the biggest deals that is talked about on September 1st.
Radamel Falcao might not be a player who can be used in many areas or has an incredible range of talents like, say, Hulk, but he is fantastic at one important thing: putting the ball in the back of the net.
Two seasons ago, his incredible form at Porto earned him a move to Atletico Madrid, which was somewhat surprising because it seemed all summer that Chelsea, lead by Andre Villas-Boas, were more likely to sign him.
After another incredibly productive season in the Spanish capital and in Europe, it is not surprising that the Colombian is being linked with a move to bigger and better things, and Falcao would flourish alongside the more well-rounded Fernando Torres or in place of him for Chelsea.
While Chelsea have an abundance of players who fill Andre Schurrle's roles in attack, there is no doubt that the German would seamlessly adapt to any position in Roberto Di Matteo's system from day one.
With Schurrle, Chelsea would get a player who can operate anywhere on the front line. At Euro 2012, he was primarily deployed as a left winger for Germany, but he is equally skilled on the other side of the pitch, and his height allows him to play at striker, as well.
Bayer Leverkusen will not let one of their best players leave on the cheap, but versatility is a valuable commodity, and Schurrle's ability to slot in anywhere he is needed for whatever reason is a trait that is only appreciated when sorely needed.
We don't know what might happen to Eden Hazard, Fernando Torres, Oscar, Juan Mata or others during the course of the season, and, when Chelsea need it most, a player like Andre Schurrle might just be enough to take the team over the finish line.