Premier League 2018/19: 5 talking points from Round 4 of the season

#1 Arsenal's defence continues to cause concerns

Arsenal's defence could be their undoing

3 goals, first away win, 2nd win on the bounce, goals by both top scorers: Pierre-Emerick Aubameyang and Alexandre Lacazette. By rights, the match against Cardiff City should be seen as job done for Unai Emery and his team.

However, the shocking display by the defence will give cause for concern as if not checked, it will derail the team's top 4 ambitions. The insistence by Emery on passing from the back continues to look ill-advised as goalie Petr Cech almost made a howler in the first few minutes against the Bluebirds.

In the centre of the backline, Shkodran Mustafi had to be bailed out time and time again by partner Sokratis Papastathopoulos. Despite his well-taken goal, one has to wonder for how long Emery will keep faith with the German international.

Hector Bellerin also had a forgettable game as he struggled against Junior Hoilett and often left Matteo Guendouzi with too much work to do. Why Emery has refused to start with Lucas Torreira remains a mystery as the Uruguayan's introduction brought a bit of calm to the defence.

It remains to be seen how Emery will fix the defence but it will be curtains for the club's ambitions if nothing is done.