Cesc Fabregas may be the forgotten man for Chelsea in the Premier League, but in the EFL cup tonight, against Leicester City, his extra-time brace finished off the Foxes to secure a remarkable comeback from 2-0 down to win 4-2 at the King Power Stadium.
The Premier League champions took control of the match early on and went into the lead through a brace from Okazaki, taking full advantage of hesitant and at times awful defending before Gary Cahill notched up a header on the stroke of half-time.
The Blues levelled through a sensational volley from Cesar Azpilicueta in the second half.
Leicester were reduced to 10-men when Wasileski was given a straight red card for elbowing Diego Costa in the face.
Seconds into extra time and Fabregas, who has not Started a league match under head coach Antonio Conte this season, put the Londoners into the lead before sealing victory with a close range effort.
Pedro almost opened the scoring at the King Power Stadium after four minutes when he thought he had nipped around the Leicester City rearguard to knock the ball home.But the Spain midfielder was adjudged to have been offside.
A Cahill fluff on 15 minutes, which saw the centre-back saw Musa race clear, but his centre-back partner David Luiz :his was quickest to respond and blocked the striker from getting his shot away.
But on 17 minutes, Chelsea were laboured in possession at the back and Ozasaki nipped in at the far post to flick a header pat Asmir Begovic.
Michy Batshuayi had a wonderful chance to equalise after excellent set-up ply by Ruben Loftus-Cheek, on 25 minutes when Pedro put across the perfect left byline cross. But the Belgium striker's header was a little mistimed and he skimmed the ball just wide of the City upright.
Disaster struck again on 34 minutes as Ozasaki took full advantage of a poor clearance by Pedro in the left-back position to smack the ball into the ground which then looped over Begovic nod into the back of the net to make it 2-0 to the Foxes.
Loftus-Cheek tried a curler on 37.minutes but Zilier was equal to the task.
On the stroke of half-time Chelsea scrambled the ball over the Leicester line to reduce the deficit.
A deep corner was needed back towards goal by Cahill at the far post, but the ball had already crossed the line before Luiz followed up to make doubly-sure.
There were no changes by either side at half time.
But the Blues got back in the game three minutes after the restart in spectacular style - the goal, from Cesar Azpilicueta who unleashed a stunning volley from just outside the City penalty area, that flashed past the home side's goalie.
Conte made his first change on 67 minutes, Loftus-Cheek coming off for Diego Costa.
Zieler produced a fantastic save to thwart Batshuayi excellent turn and shot. Seconds later and it was Costa's turn to race clear, but he could only side-foot the ball past Zieler, but also the left post.
But there was a clear momentum shift when Claudio Ranieri brought on Jaime Vardy and Leonardo Ulloa.
Conte then brought on Nathaniel Chalobah for his Chelsea bow, replacing Batshuayi with 10 minutes left.
Twice Zieler got the better of Costa, denying the striker.
Eden Hazard came on in the final minute for Pedro.
Then Wasileski, already yellow-carded hacked down Costa and was promptly handed a straight red card.
That was the end of 90 minutes forcing extra time.
The Londoners then took the game by the scruff of the neck by blitzing two quick goals by Cesc Fabregas to kill the tie off, the first a chip after. Cute back-heel by Hazard , the second a simple stroke home from close range.
The Blues then closed the game up efficiently and now await the draw tomorrow night.
On Saturday they travel to north London to face Arsenal in the league.
Chelsea: Begovic, Azpilicueta, Cahill, Luiz, Alonso, Pedro, Matic, Fabregs, Moses, Loftus-Cheek, Batshuayi
Subs: Kante, Hazard, Courtois, Costa, Willian, Chalobah, Aina
Leicester, Zieler, Simpson, Wasileski, Morgan, Chilwell, Gray, King, Drinkwater, Schlupp, Okazaki, Musa
Subs, Vardy, Hamer, Amarty, Kapusika, Ulloa, Mahrez, Benalouane