José Mourinho laid the blame for Chelsea’s slow start on the unseasonal weather, the manager moved to complain that felt his side had been “lazy” before recovering to beat Leicester 2-0 at Stamford Bridge.

After labouring through the first half, Chelsea made the breakthrough with a well-taken goal from the £32m striker Diego Costa. Eden Hazard stroked in a second on 77 minutes to maintain Chelsea’s 100% opening to the season.

Mourinho was still not happy. “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, 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 were 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.”

Mourinho added: “I told them if you have the same feeling and vision I have, we are not in trouble, because we change, but if you do not agree, we are in trouble and do not win the game. In the second half, it was better we were a positive and enthusiastic, so we were too strong for them. But let’s not forget that they had a one-on-one situation against [Thibaut] Courtois.”

Mourinho had made another big selection call in leaving the striker Fernando Torres out of the match-day squad, which included Didier Drogba who received a warm welcome on his return to Stamford Bridge.

Torres has been linked with a move to Italy, but Mourinho has no intentions of off-loading the Spaniard. “The reason is I decided to keep the same team, to have a bench with a complete balance. Sometimes I can have two strikers on the bench, sometimes I can’t,” he said.

“I want three strikers in the team. Sometimes I play with two, one on the bench, sometimes someone will be injured or suspended. I cannot do a season without three strikers. I want him [to stay]. He will play and score goals, to be very useful for us, he is a fantastic guy, a fantastic professional, so there is no problem.”

Costa, signed from Atlético Madrid, opened his account at Burnley, and Mourinho has been impressed by the speed of the Brazil-born forward’s transition.

“I got the feeling in pre-season that his adaptation would not be a big deal, he is an easy guy,” said Mourinho. “His style of play has adapted to our needs, so it has not been a problem.”

Leicester could count themselves somewhat unfortunate not to have pushed Chelsea harder given their efforts up to the hour mark.

The Leicester manager, Nigel Pearson, feels his side, who drew 2-2 against Everton on the opening weekend, should not be too downhearted.

“The players are disappointed we were unable to convert an encouraging performance with the reward of points, but there are a lot of positives from today,” he said. “The good thing is we created chances throughout the game and we wanted to be positive. For the most part, we played very well, but as always it is going to be about how efficient you are in both penalty areas and we did not quite find the right way.”

Pearson confirmed there was no further progress on a transfer for the Argentina midfielder Esteban Cambiasso, but wants to bring fresh faces in before of the deadline. “It is not that we have not been trying. It is clear we do need one or two more players, and we will endeavour to add to the squad.”