New Chelsea manager Frank Lampard has said he will work every hour possible to bring success to the club.
Lampard signed a three-year contract at Stamford Bridge on Thursday, replacing Maurizio Sarri who left after one season to join Juventus.
The club's record goalscorer was confirmed as head coach after Chelsea agreed financial terms with Derby County, where Lampard was in charge for one season, and said he was keen to get to work quickly.
"I'm delighted to be here," Lampard told Chelsea's website. "The club's been in my heart for a long time.
"But once we move beyond the emotion, what they get from me is a young manager, a manager that's going to give everything, every hour in the day to work hard to bring a team the fans can be proud of.
"If I can see a team that works hard, has high energy, really had talent and the talent I know is in the squad already, then I'll be happy."
Former midfielder Lampard spent 13 years with Chelsea, winning the Champions League in 2012 along with several domestic honours, and is the club's record scorer with 211 goals from 648 appearances.
He led Derby County to the Championship play-offs last year in his debut season as a manager and his place in the club's history is already assured, with his goals contributing to three Premier League titles and four FA Cups.
However, the former England midfielder takes one of the most insecure jobs in the Premier League.
The 12th manager in 16 years under the ownership of Roman Abramovich, Lampard will be expected to restore Chelsea to the fight for the Premier League title immediately.
After just one season at Derby, Lampard's experience is limited.
But Chelsea director Marina Granovskaia said he had already shown he is "one of the most talented young coaches in the game".
"It gives us great pleasure to welcome Frank back to Chelsea as head coach," she said. "Frank possesses fantastic knowledge and understanding of the club."
"After 13 years with us as a player, where he became a club legend and our record goalscorer, we believe this is the perfect time for him to return and are delighted he has done so.
"We will do everything we can to ensure he has all the support required to be a huge success."
Lampard said he would try to produce the kind of attacking football Chelsea fans had become used to over the past years.
"I want to remain competitive help the younger players, get them into the squad and I'll work hard to try to bring success to the club.
"It's very easy to throw out words ... but for me, I can't wait to get working and see the team on the training ground. I want them to play good football, I want them to move the ball quickly.
Lampard said he had taken pieces from every manager he had played under but would be his own man.
"I don't want to be a clone of any one manager, I'll try to take on all the information good bad, and be myself."
"My absolute desire is to be here and work hard, I think I did that on the pitch, tried to get the best out of myself, and that's what I'll try to do as a manager."
Former Chelsea midfielder Jody Morris and Chris Jones, who worked with Lampard at Derby, have also joined him at Stamford Bridge, while Petr Cech, the club's former goalkeeper, was named as the club's technical advisor in June.dpa