England one-day captain Alastair Cook has signed a new two-year contract with Essex, which runs until 2013.
Despite his international commitments, the 26-year-old has played six County Championship and four CB40 games this summer, scoring 655 runs.
Cook said: "I have played at Essex all my life and they have always been very supportive when I play and when I'm away with England.
"I am delighted to sign a two-year contract with Essex."
He added: "I look forward to being part of a young squad which I'm sure will win trophies."
Cook made his Essex debut in 2003 and won his county cap two years later.
He played his first Test for England in March 2006 on the tour of India, scoring 60 and 104 not out in Nagpur, and made his one-day bow against Sri Lanka at Old Trafford that summer.
Cook has gone on to make 5,520 runs in 68 Tests at an average of 49.28, with a highest score of 235 not out in the drawn first Test of England's victorious Ashes campain at Brisbane last November.
The left-hander was left out of the squad for the subsequent World Cup in India and Sri Lanka, but was appointed one-day captain in May, leading England to a 3-2 victory over Sri Lanka in his first series in charge.
Essex head coach Paul Grayson added: "Everyone at the club is delighted that he has signed a further two years to his contract and we of course continue to appreciate the commitments he has with England.
"When Alastair is at the club, he is an outstanding player with great professionalism and provides a huge influence to the younger players in the team with the way he conducts himself and trains.
"He has very promising years ahead of him and we will always welcome him back to Essex when he is not away with England."