Diego Costa is confident he will put his World Cup disappointment behind him and make a huge impact for Chelsea next season.

The £32million striker is set to join his new team-mates for the first time when they leave London to start a pre-season training camp in Austria next week.

Costa was Atletico Madrid’s top scorer last season with 36 goals but drew a blank at the World Cup as Spain crashed out at the group stage.

The 25-year-old has been getting over the disappointment during three weeks on holiday and is adamant his poor World Cup will not affect his new start at Chelsea.

He said: “I am hopeful for what is happening in my life and I will adapt well. I have wanted to play in the Premier League for a long time and I think it will be a very good and fast adaptation. I do not think there will be many changes to the style of play (compared with Atletico). Chelsea are a great team and the Premier League is good to play in.”

Costa is preparing to fight Fernando Torres for a starting role, even though Chelsea have been trying to offload his Spain team-mate.

Inter Milan and Torres’s former club Atletico Madrid both expressed an interest but his £175,000-a-week salary has proved a major obstacle.

Costa said: “It’s always good to have competition. The important thing for a big club is having great players. Torres is a great player, I know I will have to fight hard to be among the team but I like that. So I think it will be a clean and healthy competition.”

Costa controversially opted to play for Spain rather than his native Brazil, even though he had already made two appearances for the World Cup hosts in friendlies.

He was jeered by the home fans during his three games at the finals but when asked if he had any regrets, added: “Never, I’d do it again. I do not regret anything I do in my life.

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“I’m not hurt [by all the criticism]. I was realising a dream of competing for a World Cup and I thank God for that. So there’s no reason to be offended by anything that has happened.

“I hope to be in the next World Cup. I will try to maintain the level during the next four years and if I have the opportunity to live another moment like this, to compete in the World Cup in Russia, I would be very grateful.”

Meanwhile, Chelsea hope to tie up new deals for Cesar Azpilicueta and Gary Cahill before the season starts.

Both are under contract until 2017 but Chelsea want to reward them for being part of the best defence in the Premier League last season.

Azpilicueta, whose performances knocked Ashley Cole out of the side, will have his £35,000-a-week salary doubled. Cahill, who is on £70,000 a week, will see his weekly wage increase to more than £100,000.