While Chelsea's defeat to Arsenal doesn't prove that the Blues are not going to win the Premier League - or that the Gunners will - it is a sure indicator of some of Chelsea's frailties going into the season.
With just one preseason match remaining against Italy's Fiorentina, Chelsea have one last chance to take home an elusive preseason win. Their International Champions Cup run was rather dismal. A defeat to the New York Red Bulls and two draws against Paris Saint-Germain and FC Barcelona. The match against Fiorentina at Stamford Bridge will be their last chance to find some form and confidence before the season begins.
That said, what have Chelsea been doing wrong? It seems as though Jose Mourinho simply hasn't done enough in the transfer market. Chelsea are a brilliant team, no doubt. They collected the Premier League trophy last season without much argument from other teams. But, from the looks of their preseason, they're going to have to strengthen in certain areas if they are to again mount a challenge for the title.
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Outside of his starting XI, Mourinho doesn't have enough talent to choose from when needed. This was clear when the only player on the bench that would be able to change Sunday's match against Arsenal was Oscar.
Here are three areas in which Mourinho can strengthen his squad in order to increase depth before the upcoming season.
1. Find a better back-up for Diego Costa
Radmel Falcao arrived at the club following the departure of club legend Didier Drogba. However, the Colombian's performance in pre-season hasn't seen much improvement since this summer's Copa America. Loic Remy couldn't find his best side for Chelsea this pre-season tour either.
The question is whether or not Falcao will provide adequate replacement for Diego Costa when/if the latter finds himself injured. For now, it doesn't look so. Mourinho has most likely seen something other clubs haven't in the front man and will be looking to get the best out of him. However, if he fails to do so Chelsea will be left with no adequate replacement for Costa.
2. Balance in midfield
Chelsea's Champions League campaign last season sometimes saw them sadly exposed for extended periods of time. While Cesc Fabregas has managed well enough alongside Nemanja Matic, Chelsea saw tough times when they played against a 10-man PSG last season and were outperformed in midfield. Ramires simply isn't cutting it for Chelsea either.
One solution would be to push Fabregas further up the pitch and find someone with the physicality and defensive awareness to play alongside Matic.
3. Defensive back-up
Now this isn't an area where Chelsea lack much. Defensively, Kurt Zouma had an impressive run with the side. But, there needs to be a replacement for John Terry.
All credit to him for remaining fit for the whole 2014/2015 campaign, but at the age of 34, it seems unlikely that he will be repeating that feat.
Some cover for him would be reassurance for the back line.
What areas do you think Chelsea could strengthen in ahead of the upcoming Premier League season?