Frank Lampard believes Tuesday's Champions League clash with Lille will be a defining moment for Chelsea's youngsters.
Chelsea can book a place in the last 16 of the competition with victory at Stamford Bridge, while a draw will be enough if Valencia lose to Ajax in the other Group H fixture.
The Blues' only two European wins this term have come on their travels, and Chelsea have notoriously struggled at home since Lampard took over this summer.
Editors' Picks
The former midfielder hopes the make-or-break nature of the Lille match can bring the best out of his players as some of his younger stars are still adjusting to the level of matches of this magnitude.