Branislav Ivanovic has signed a new contract at Chelsea until 2016.
Ivanovic, 26, joined Chelsea from Lokomotiv Moscow in 2008 and has gone on to establish himself as an important part of the first-team squad, regularly featuring at right back and centre beck.
"It is good news for me," he told the club's official website. "It is a very big step for me in my career and I want to give my maximum and try to help Chelsea win a lot more trophies.
"These things take a little time but my first vision was always to stay with Chelsea. There were not a lot of problems because I wanted to stay, the club wanted me to stay and I want to thank everyone who helped with the deal. I am very happy with that."
Although he was given his debut by Luiz Felipe Scolari, Ivanovic made his breakthrough at Chelsea under Guus Hiddink and scored two goals in a dramatic Champions League quarter-final victory over Liverpool in the 2008-09 season.
"I don't like to think too much about the past because in football you have to get better every day, concentrate on small details of every game, but from my side maybe the two goals against Liverpool gave me confidence," he said.
"But all other things have been slowly developing and step-by-step, which is what I have to do in the future.
"For every player coming to a new country you have to adapt and then you become better and better, but I now feel so comfortable here and I really enjoy being a Chelsea player and my wish was always to stay here.
"Now I think I can give many more good games. The three years has gone very quickly, and I think it has been a success so I hope to carry on getting better and better with Chelsea."
Fellow right-back Jose Bosingwa is out of contract at the end of the season and it remains unclear whether he will prolong his stay at the club.