Chelsea emerged from their season opener with all three points in a 3-1 victory at Brighton & Hove Albion thanks to goals from Jorginho, Reece James and Kurt Zouma, but the Blues still experienced issues at the back.
The Seagulls were dominant through the first hour of the contest, taking the play to the Blues and if not for a shocking miss from Lewis Dunk on a free header and a deflection on Zouma's goal, the outcome could have been different.
With that in mind, we take a look at the storylines emerging from the game.
Chelsea may regret letting Tariq Lamptey leave
To sum up his performance in a word: brilliant. His defensive skills were on full display as he had the most tackles and interceptions of any Brighton player. His combination of skill, pace and audacity was being showcased routinely, getting an assist on Leandro Trossard's goal.
He won seven duels, showing off his aerial ability, five recoveries displaying his improving defensive skills and putting in four crosses gave everyone a glimpse of what he can do in build-up play.
At just 19, these types of performances, which have been become familiar to those who follow the Seagulls since his arrival last year, may have Frank Lampard wishing he was still at Stamford Bridge.
Werner's counterattacking skills on full display
Despite being outplayed for two-thirds of the game by the Seagulls, the newly-signed German was posing constant threats all over the field. His pace is lethal, his runs that were made were deadly and he was constantly presenting himself as a target.
None of this was more evident then when he used his pace to win a penalty after being brought down by Brighton goalkeeper Matt Ryan.
He continued to cause problems after that, nearly scoring on a few occasions. If this is what Werner can do in his first game in English football, the rest of the league better watch out.
Thiago Silva's presence is badly needed
Having not played for the club yet because of injury, the Portugese is sorely missed as the Blues duo of Andreas Christensen and Kurt Zouma struggled to contain the Brighton attack and were given a huge let-off when Lewis Dunk missed on a header from five yards out where he was left unmarked.
This has been an issue for Chelsea for a while now and while the back line is tactically sound and very athletic, they often have problems when asked questions with no discernible answer.
Kepa Arrizabalaga can also be a liability in goal at times and for all of these reasons, Silva needs to be in the side as quickly as possible.