Jermaine Jenas has slammed Chelsea's transfer policy and says it "makes no sense" to sign Christian Pulisic and potentially sell Callum Hudson-Odoi.
An emotional Cesc Fàbregas broke down in tears after he was substituted off the pitch in what could be his final Chelsea match.
Fortunately for Fabregas, his countryman Alvaro Morata was on hand to bail him out with a rare couple of goals. Morata then doubled the lead with a header 10 minutes later as Sarri's mean eased into the fourth round.
The Spaniard missed a penalty for the Blues, with Forest keeper Luke Steele making the save. The former Juventus striker managed to scoop the ball over the bar from no more than three yards out and although he was saved by an offside flag, it was still hard to fathom exactly how he managed to scoop the ball so far over with the goal gaping.
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Then again, he might have more than enough money to simply retire after 16 years as a head coach in the NFL. Team chairman Stephen Ross said it was time for the franchise to ditch a philosophy that was not working.
Fabregas had the chance to bow out with a goal before his rumoured move to Monaco, but had his first-half spot-kick saved.
Three minutes before half-time, his body broke down on him again and he was replaced by Eden Hazard.
But it didn't matter for the Blues as they ran out 2-0 winners, however it was Fabregas' substitution that stole the headlines.
Barkley and Hudson-Odoi both had shots kept out by Steele in the remaining minutes, but the biggest cheer was reserved for Fabregas, who departed the Stamford Bridge field for one final time late on.