Chelsea boss Frank Lampard is banking on his young players having learned from their Champions League defeat to Valencia.
The Blues are at Lille this week.
"For some, it will be their first taste of that [a Champions League away game] and they need to learn very quickly," said Lampard.
"Anywhere in Europe, away in the Champions League is tough.
"There's a mindset to it, an approach to it, and our concentration levels have to be maximum. We saw that against Valencia, where we were the better team, but we switched off for a second and lost the game.
"We need to learn those lessons fast, plus we have experienced players in the team that need to help that and the young players on that front."
