Chelsea boss Thomas Tuchel blamed the English weather for defeat at home to Brentford.
The Blues boss confessed he had no idea why his players collapsed to a humiliating 4-1 defeat after taking a 48th-minute lead with an Antonio Rudiger 39-yarder.
He complained: “We worked so hard to open the scoring but after that we stopped defending and gave away three goals in ten minutes which completely killed the game for us.
“It's on us. It's our fault.
“I don't know why, but we lacked maturity in our defending and we were not aware of the danger in these moments, which is very strange for us.
“It's normal to feel leggy after the international break and my expectations for this match were not high because of that.
“But you don't need to lose like this as a consequence and it's not as though we conceded the first two goals and were never able to catch up after that.
“I felt we were more tired mentally than physically and not fresh enough, which is not normal for us.
“But also yesterday, we were wearing gloves and it was snowing during training and then today it was very, very warm.
“It was also more difficult for us to play as the favourites than it was for Brentford as the underdogs because we only had half of a training session to prepare for this match."
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