Chelsea pair Deivid Washington and Michael Golding made appearances in yesterday's FA Cup win against Preston.
The Blues won 4-0 on the day, with Washington and Golding second-half substitutes.
Brazilian striker Washington came on in the 76th minute to lead the Chelsea line. He had made his debut earlier this season against Brentford.
Meanwhile, 18 year-old midfielder Golding replaced Enzo Fernandez in the 89th minute, making his Blues debut in the process.
Golding is a regular with the U18s and has tasted U21 action before yesterday's debut.