We travel to Stamford Bridge with a 2-0 lead from the first leg after goals from Josh Onomah and Kasaiah Sterling at the Lane.
A two-legged semi-final is a new challenge for the lads and all-action midfielder Luke said: "We’re confident going into all games, so we’re not going to treat this one any differently.
"We’re certainly not going to sit back and invite pressure onto us, we’ll look to attack, try to score an early goal and try to win the game on the night.
"We were delighted to keep a clean sheet in the first leg and 2-0 gives us a good platform.
"I'm sure Chelsea will throw everything at us but it's up to us to deal with that."
Luke underlined what it would mean to the lads to get through to the final. "It would be massive for us to be part of a successful FA Youth Cup team and great for the club as well."