Chelsea manager Jose Mourinho was left unimpressed by their 2-0 win over Leicester City.
After a poor first half-time, Diego Costa and Eden Hazard struck the goals for the hosts.
Mourinho, though, was not happy with the slow start.
He said: "I prefer to train in the morning, but this week I trained in the afternoon because this is not the best weather to play football, you get lazy.
"This weather pushes players to be a bit lazy, to lose a bit of tension, a bit of sharpness in your body, after that you pass slow, you do not react to the second balls, the time goes on and on, then when you wake up, it is half-time.
"In the first half, the team was lazy, and I did not like that.
"But they improved in the second half and they won, which is the most important thing.
"At half-time, we had to be a bit emotional with them. I told them the way we were playing was not good enough to win the game and that we were at risk.
"It is impossible to play football if you do not win one second ball, it was basic but important things."
