Chelsea suffered a 2-1 defeat at Southampton as early season struggles continued for Thomas Tuchel's side.
Despite Raheem Sterling giving the Blues a lead in the 23rd minute, the Saints levelled five minutes later on 18-year-old Romeo Lavia's spectacular goal.
It was then in first-half stoppage time that the home side took a lead they would not relinquish courtesy of a deflected effort from Adam Armstrong.
1. Will loss bolster Tuchel's call for signings?
This was a bad night for Chelsea. Southampton recorded their first home win over the Blues since March 2013 and they were good value for it, too. Raheem Sterling opened the scoring following a bright start but as soon as Romeo Lavia equalised with a fine strike five minutes later, Chelsea began to play within themselves.
Disjointed in midfield, blunted in attack, this was a night which called into question Thomas Tuchel's decision to utilise a 4-2-2-2 system that did not seem to suit the players at his disposal. If that is the way he wants to play in future, Chelsea really need to get active in the transfer market.
They are looking at bringing in at one striker and a winger -- Pierre-Emerick Aubameyang, Anthony Gordon and Wilfried Zaha are among their targets -- and a display like this, not their first sub-par outing of the campaign, should sharpen minds with two days left of the transfer window.
Co-owners Todd Boehly and Behdad Eghbali were both in attendance here to witness it first-hand. That might end up being a good thing in the long run.