Chelsea boss Maurizio Sarri has said that he is shocked by the team’s second half slump.
“[Chelsea were] very good in the first half, I think. Really, [we played] very well,” he told reporters at his post-match news conference.
“As usual in the last two months, we started very badly in the second half. We need a solution. We need to solve this problem.
“In the last 10 matches, we started like in this match [in the second half]. It’s a big problem. We have to concede it’s a match for qualification, not for three points, but probably at the end of the first half we thought we were qualified.
“But against these opponents, it’s not true. They have physical numbers. I have never seen something like that [Slavia’s fitness] in the last 20 years.
“The number of accelerations, the metres in high speed, the running… I’ve never seen anything like that in these opponents.
“So, the second half clearly could be difficult for us, but we did something wrong. In the first 10 or 15 minutes of that half, they scored from 18 metres without being opposed, twice.
“At half-time I told them that the target was to start with the same application and attention in the second half, but we didn’t do [it].
“I don’t know [why], and it’s not easy to understand, otherwise we can solve the problem very easily.
“It’s very difficult to understand why. I can try without going into the dressing room at half-time. I can try if that’ll solve the problem.”