Chelsea boss Avram Grant has signed a four-year contract at Stamford Bridge.
Chelsea have lost just once during Grant's spell in charge
Grant, 52, took over as Chelsea boss in September in the wake of Jose Mourinho's departure.
The former Israel coach lost his opening match at Manchester United, but has since guided the Blues to a 16-match unbeaten run.
Chelsea lie third in the Premier League, three points behind leaders Arsenal and have qualified for the second round of the Champions League.
It had been widely thought that Grant was merely placed in charge at Chelsea until the club identified and secured its preferred manager.
Henk ten Cate arrived at Stamford Bridge from Ajax in October amid speculation he would be in line to take over from Grant.
And Guus Hiddink was heavily linked with the Chelsea manager's job before he signed a new contract to extend his stay as Russia coach.
But chief executive Peter Kenyon said in November "there is no time limit (on a decision over Grant) because we are talking about Chelsea being successful".
And the Chelsea's fine run of form under Grant has led to the Blues board tying the Israeli down to a long-term contract.
He became embroiled in a row over his coaching qualifications with Grant yet to receive his Uefa Pro License which is normally required in European competition.
But Uefa insisted it had no plans to ban him from coaching.
Grant first came to England in 2006, when he was appointed technical director at Portsmouth.
Earlier this year, he took on a similar role as director of football at Stamford Bridge and was placed in charge of the first team alongside Steve Clarke when Mourinho parted company with the club.
Chelsea were fifth in the Premier League when Mourinho departed, two points behind leaders Arsenal and having made a modest start to the Champions League with a 1-1 draw at home to Rosenborg.
The Blues visit Arsenal on Sunday where a win will take them level on points with the league's pacesetters.