Welcome to our live coverage of the FA Youth Cup clash between… hang on. It says here this is a proper FA Cup match, yet Manchester City are giving debuts to five teenagers. Chelsea are at full strength. #romanceofthecup

Fabregas lucky to escape a yellow card for a late, lunging tackle on Garcia.

Another good run into the box by Pedro, this time down the right, and he forces a corner. However, it's a corner that City clear.

Strong run by Pedro into the box but he's halted by Adarabioyo.

Good spell by City here, but struggling to convert their possession into chances at the moment.

City sub: Barker on, Celina off.

GOAL! Chelsea 3-1 City: Cahill scores! Hazard's cross isn't dealt with by Fernando and Cahill, who was still up from the previous corner, lashes a low shot under Caballero, who should save.

Willian's corner is headed clear by Faupala, but Chelsea well on top here.

Willian pokes the ball through to Pedro, who forces a Chelsea corner.

Pedro takes a tumble in the box, but a penalty was never on the cards there.

Another fine finish by Chelsea's player of the season there. That didn't take long after the restart.

GOAL! Chelsea 2-1 City: Willian scores! He breaks forward and finds Hazard on the right, Willian continues his run and gets the ball back from Hazard and finds the far bottom corner with a crisp finish.

SECOND HALF. We're back underway.

HT Chelsea 1-1 City: Manuel Pellegrini's young City side level a minute after going behind to Diego Costa's opener. Wide open at the break.

This time Willian has a shot closed down, but he could have threaded a ball through to Costa or Hazard. Chelsea trying to re-establish their lead before the break.

Pedro has another shot deflected away for a corner. Has been the danger man for Chelsea so far.

PEDRO CHANCE! Caballero with a great reaction save to keep out Pedro, who found space in the box again from a Fabregas cross.

City don't deserve to be level but Chelsea have paid the price for sleeping after taking the lead.

GOAL! Chelsea 1-1 City: Faupala scores! Barely a minute after going behind, City level. Iheanacho races into a shooting position but crosses for Faupala, whose scores via a deflection from Azpilicueta's attempted clearance.

That's Costa's fourth consecutive home game with a goal.

GOAL! Chelsea 1-0 City: Costa scores! Chelsea finally make the breakthrough. Fabregas the architect, lifting the ball into Hazard's path, he hooks a cross into the six yard area and Costa throws himself at the ball, burying his header from close range.

Iheanacho has a go from distance, but his long-range effort was always rising over the bar.