New Chelsea manager Jose Mourinho does not believe the club needs to bring in a lot of players in the summer, while admitting the landscape of the English Premier League had changed from his first stint with the West London side.
Mourinho was appointed the new manager by Chelsea on Monday, with the popular Portuguese signing a four-year deal.
The former Real Madrid and Inter Milan manager is expected to be given a huge transfer budget with several players already reportedly lined up to strengthen an already quality-filled squad.
The highly successful manager has been linked with moves for the likes of Edin Dzeko of Manchester City, Stevan Jovetic of Fiorentina, Porto defender Eliaquim Mangala and Roma stalwart Daniele De Rossi.
However, Mourinho insisted his primary job is to improve the group of players already in the club.
"We have to improve the team, but when I say improve the team people are already thinking about how many millions Chelsea will spend," Mourinho told the club's official website. "When I say improve the team, I mean through work.
"My work has to improve players and improve the team. If I don't do that I am not happy with myself.
"If after that we can improve the team by buying a couple of players it is fantastic, but I have to improve the team and the players with my work.
"The priority is to improve. In the last two years we have struggled in the Premier League.
"If Chelsea didn't win the Champions League then the club wouldn't have been in the competition this year. This year we had to fight until the last match to qualify.
"We must improve individually, improve collectively and improve the structure of the club around the football team, and try to win the next match.
"Which one is the next match? The Premier League? Let's go for the Premier League. If the next match is the FA Cup, let's go for the FA Cup.
"It's difficult for me to say something is the priority. The priority is to work hard, work professionally and make the team better."
While Manchester United and Arsenal were dominating the Premier League before he came in in 2004 to upset the applecart, Mourinho believes now there are a lot more teams capable of competing at the top, and the failures of the English clubs in this season's Champions League does not mean the quality has gone down.
"The Champions League is a thermometer of world football and English football was out of the competition too early," he added.
"People were speaking about the level of the Premier League going down compared with other countries, but I don't believe that. Sometimes things happen when there are no reasons.
"But the Premier League is still a fantastic competition and I believe five or six teams are very strong.
"When I was here before it was more about us, Man United and Arsenal and after that there was a gap to the other teams.
"Now you can put five or six teams in the same plan, aiming to reach the Champions League spots which is very difficult, with those with more ambition aiming to win the Premier League.
"The competition will be fantastic and I hope I can beat the other clubs."
The Portuguese also could not hide his excitement at taking over at his beloved Chelsea, saying he was ready to start work immediately if the players were available.
"I don't need a holiday, instead I'm sorry we don't start training tomorrow," he said.
"Victory makes miracles -- when you win you are never tired. Happiness is much stronger than tiredness. Players need holidays, I don't.
"When we start the players will meet someone with great motivation. In spite of my white hairs, which I didn't have in 2004, I'm still very strong at work."
