Chelsea boss Enzo Maresca praised the club's academy graduates after Tyrique George scored his first senior goal and fellow teenager Josh Acheampong also impressed in their 3-0 Conference League quarter-final first-leg win over Legia Warsaw.
Winger George, who has never started a Premier League match but regularly featured in Europe, showed quick reactions to hand the Blues the breakthrough in Poland, tapping home when Reece James' long-range strike was pushed out by goalkeeper Kacper Tobiasz.
That came minutes after the 19-year-old had moved infield to the number 10 role following the withdrawal at half-time of Cole Palmer, whose replacement Noni Madueke netted twice.