2. Significant lapses in concentration at the back
With just two clean sheets all season in the league, one of the many obstacles faced by the young Chelsea side is quite obvious. The Blues struggle to defend set pieces, in particular. It'd be immensely essential to highlight the same later on, but a few errors the Chelsea back line commits is the space left behind the full backs, major lapses in concentration or simply schoolboy mistakes.
In corners and free-kicks, the team's semblance looks rather static, owing to the strict zonal marking. There's little tracking, even lesser attention paid to the minor details and a certain lack of distinct communication. Sometimes they fail to clear their lines or track the opposition bodies at the near post. Today, it was a matter of not winning the second balls.
Initially having shut out the danger, Chelsea, as soon as the headed clearance, should have stepped out of their lines as a team to catch the opposition team offside, something that backfired spectacularly. Bournemouth scored the only goal of the game courtesy of that momentary lapse in concentration, which doomed the Blues to their 4th loss in 5 Premier League games.