Gianfranco Zola was impressed by what he saw from Chelsea loanees Mason Mount and Fikayo Tomori during his side's 3-2 win over Derby County.
The Premier League giants moved into the Carabao Cup quarter-finals after the tight win at Stamford Bridge on Wednesday.
Tomori and Richard Keogh scored own goals for Derby, who fought back on both occasions through Jack Marriott and Martyn Waghorn, before Cesc Fabregas' 41st-minute strike proved to be the winner.
Mount and Tomori are both on loan from Chelsea and Zola enjoyed the duo's performances.
"He [Tomori] has been unlucky with the own goal, but the performance he and Keogh put on afterwards was excellent," the Chelsea assistant told a news conference.