Chelsea were convincingly beaten 3-0 by Leeds United at Elland Road on Sunday afternoon.
Both sides got off to a flying start, with action coming at each end, but it was the Blues who were looking the more likely to find an opener.
Raheem Sterling found the back of the net first but celebrations were cut short as he was flagged for offside.
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The visitors were punished in the 33rd minute, when a sloppy error from Edouard Mendy handed Brenden Aaronson one of the easiest goals he will ever score.
Just four minutes later Chelsea's pain was doubled, when Rodrigo Moreno headed home from a Jack Harrison to extend the hosts lead.
After a woeful opening 45 minutes the west London side opted not to make any changes at the break.
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Eventually both Hakim Ziyech and Christian Pulisic were introduced but little difference was made.
In fact it got worse for the Blues, a third was added by Harrison in the 69th minute to add more woes to an already damaged Chelsea side.
The visitors searched for a consolation but it was to no avail.
To top things off, Kalidou Koulibaly received an unnecessary second yellow in the 85th minute.
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A frankly embarrassing performance all-round and drastic improvements are needed for when they take on Leicester City next weekend.
Here are five things Absolute Chelsea learned from the encounter in Yorkshire.
1) Kovacic and Kante heavily missed
Tuchel picked a midfield pivot of Conor Gallagher and Jorginho to take on Leeds and it highlighted how much the Blues miss both Mateo Kovacic and N'Golo Kante. For Gallagher it was a chance to start and impress, but he failed to do so. If injuries are going to be a problem this season, a solution needs to be found, quickly.
2) The individual errors need to stop happening so frequently
Once again Chelsea found themselves behind in a game due to a clumsy error. In the seemingly never-ending cycle of sloppy mistakes it was the turn of Mendy today. If Tuchel's side hope to compete for trophies and ensure they cement a top four place this season errors like these simply have to be cut out.
3) Signings still need to be made
The transfer window closes in less than two weeks and Chelsea are still needing to get business done. Despite a total of six signings arriving at Stamford Bridge this summer the squad requires further improvement. Most noticeably a new number nine is needed, so far things have not worked out for Kai Havertz this season. The midfield and defence also could do with adding to, particularly if injuries become an issue this season.
4) Getting a top four spot is going to be a tough task
With both Arsenal and Tottenham Hotspur claiming three points this weekend, two of Chelsea's direct rivals for the top four have gained an advantage. While the Blues could have easily defeated Antonio Conte's side last weekend, it is certainly a cause for concern the way the two North London teams are playing.
5) The final third play requires drastic improvement
While the hosts made Chelsea's defence look silly, the attack still deserves a fair dose of criticism. Only three attempts on target were managed from the visitors and they wasted multiple opportunities. Of course Sterling was unfortunate to have a goal disallowed, but the Blues finishing was pathetic on a whole.
Topics: Chelsea, Leeds United, Premier League, Football
Sam Collins