Thomas Tuchel blamed Chelsea's lack of maturity, tired minds after international travel and even the British weather after watching his team slump to a thrashing at home against Brentford.
'We lacked maturity in our defending,' said Blues boss Tuchel. 'We were not aware of the danger in these moments which is also very strange for us. We got punished and that's also not normal. It's a summary of strange events. It's on us, it's our fault.
'We felt leggy, which is normal after the break. We struggled in the beginning. I felt us more mentally tired, not fresh enough.