Asked about the performances by Mount and Tomori, who are both on loan at Derby from Chelsea, Lampard said: 'It wasn't great for Tomori in the first four minutes, but I thought his character was enormous.
The 40-year-old already has a giant-killing to his name as Derby boss, having overseen their thrilling penalty shootout win over Manchester United in the third round of the EFL Cup.
9' - GOAL! Chelsea 1-1 Derby: The visitors are level!
"I left through the back door and it upset me at the time but I have nothing but great memories of this place and they thank me like that".
"They've got players who showed they'll be more than capable of holding their own if they come up to the Premier League".
The former England worldwide has called time on his playing career and is now leading Derby towards a promotion push in the EFL Championship.
Jack Marriott and Martyn Waghorn scored the goals for Derby, with Cesc Fabregas scoring the victor just before half-time.
Assistant manager Gianfranco Zola stated that Olivier Giroud could miss the clash through injury, leaving Chelsea's only senior striker available as Alvaro Morata, who has scored in three of his last four club appearances.
After scoring the fourth during Chelsea's 4-0 win over Burnley, Ruben Loftus-Cheek could be handed with another start for Sarri's side against the Rams.
Mason Mount, on loan at Derby, played against Chelsea. Tomori could provide the assist for a late Mount consolation goal and following another rousing rendition of "Super Frankie Lampard" after the full-time whistle, everyone would go home happy safe in the knowledge that the order of things had been preserved, a legend and his sidekick had been saluted and a couple of young bucks from the academy had been cheered on their way.
Despite the gulf in stature of recent times, Derby and Chelsea have had a fairly equal record in their past meetings.
Predicted Derby County XI: Carson; Bogle, Tomori, Keogh, Forsyth; Wilson, Huddlestone; Waghorn, Mount, Lawrence; Nugent.
I don't think he is going to be involved in the game tomorrow, but he is looking quite good for the weekend.
Key Stat: Chelsea have conceded three goals in their past three matches across all competitions.
The last time Frank Lampard walked onto the Stamford Bridge pitch in away colours, he was booed. Inevitably, he would go on to score against his former employers, which angered the dissenters even more.
Interestingly, now Derby manager Lampard scored four goals that day, but will be hoping for less of the same come Wednesday - though goals are a guarantee.